also equally effective (compare J. Am. Chem. Soc. 47, 2678 (1925)). Argon when mixed with electrolytic gas also was found to have a positive catalytic effect, though less than that of nitrogen.

The generality of the effect having been thus extended, the question arose as to why CO2 when generated in other reactions had failed to show a similar catalytic effect. Is the exception peculiar (1) to CO2, or (2) to the systems in which it has been generated, or (3) to both? To settle (1), CO2 has been used in acetylene polymerization and in water synthesis with = 17.4, at a point

2

2

– Mc2н2 the following results: N(0212 + CO2) in the reaction where 55 per cent. of the positive ions are CO2+. While it thus appears that CO2 acts quite normally as an inert ion catalyst, about 10 per cent. of CO, was found to be lacking in the gas phase at the end of the reaction when C2H2 was completely exhausted from an initial (1:1) mixture. Whether this amount of CO2 had reacted chemically has not been determined. In the system 1(2H2 +02) + 1C02, carbon dioxide did not prove to be inert. The entire rate of reaction was accounted for as the sum of the known rates of the separate reactions: 2H + O2 and 2H2+ CO2 (loc. cit.)

2

2

To settle (2), argon has been used as inert catalyst in the reaction 2CO + O2 =2CO2, where CO2, although produced by the reaction, fails to accelerate it. Argon was found to catalyze the reaction, but less than the normal, just as it was found to do in the oxidation of hydrogen.

In discussing these results, Professor K. T. Compton proposed a very interesting hypothesis, namely, that when the inert gas has a higher ionization potential than the reacting gas has, the positive ion of the inert upon colliding with the neutral reactant molecule will ionize the latter by taking away an electron from

another way: Does the ion of the inert revert to the neutral state upon first effective collision with the reactant, or not until after clustering is complete and electrical neutrality is reestablished by the return of an electron? Professor Compton has volunteered to approach the question from the physical side and we have planned a series of experiments which ought to afford a decision through the chemical evidence to be obtained. A more extended discussion will be postponed, awaiting the new results. S. C. LIND,

FIXED NITROGEN RESEARCH LABORATORY, U. S. DEPARTMENT OF AGRICULTURE, WASHINGTON, D. C.

CONCENTRATION OF THE GROWTH-PROMOTING PRINCIPLE OBTAINED FROM YEAST. (VITAMIN B.)

It was reported in our previous communication1 that the growth-promoting principle present in the brewers' yeast could be prepared in a form which was in a unit weight approximately 2,000 times stronger than the dried yeast itself. The substance was still a complex mixture. Further purification was made difficult by the fact that the process was accompanied by large losses of active material. It was urgent therefore to seek for a more economical method of concentration. Such has now been developed.

In only three steps a material is obtained which is equal in potency to the material previously described and which is associated with a loss of only 50 per cent. of the original material. The starting material is the fraction of yeast extract prepared according to Osborne and Wakeman. The aqueous solution of this material is brought to pH=4. Some inert material settles out. From the solution the active material is

2 2

= Ne+ C2H2+. The C2H2+ then behaves just as if it had been originally formed by an alpha-particle collision. This would explain at once why the inert ions have the same power of producing polymerization as have the primary ions of the reactant. The catalytic reactions so far considered conform generally with this principle-but it will be possible to give it a severer test by choosing inerts with ionization potentials definitely lower than those of the reactants. Then there should not only be no positive catalysis, but a high degree of negative catalysis by the reverse process.

The question resolves itself into a fundamental one of the properties of gaseous ions. When the positive ion of the inert gas meets a neutral molecule, do they exchange the positive charge, or do they unite and form a clustering center? Or, putting the question

terial is treated with nitrous acid and by this treatment a substance is obtained which is active in daily doses of 0.0018 gm. The maximum loss in active units is 10 per cent. Often such material is prepared without any loss in active units. The composition of this material is C=38.2, H=6.0, N=10.3, P=7.6, S=1.46, NH,.N= 0. The sulfur was present mostly in the form of SH groups. From this material the active principle was extracted with silica gel. From the gel by extraction at pH 9.5 a material was obtained which was active in daily doses of 0.00008 gm. The material contained about 4 per cent. of sulfur. The white rat was used as the experimental animal. P. A. LEVENE,

B. J. C. VAN DER HOEVEN

1 Levene, P. A., and van der Hoeven, B. J. C., J. Biol. Chem., xlv, 483 (1925).

ABBOT, C. G., Solar Variation and the Weather, 307, 426 ABEL, J. J., E. M. K. GEILING, G. ALLES and A. RAYMOND, Researches on Insulin, 169

Academy of Sciences, National, Report on Forestry, 5, Abstracts of Papers, 519; North Carolina, B. CUNNINGHAM, 37; Michigan, L. R. DICE, 58; Ohio, W. H. ALEXANDER, 60; Indiana, H. F. DIETZ, 62; Iowa, P. S. HELMICK, 248; Russian, 173, 301

Acid, B-Oxybutyric and Lactic, P. A. LEVENE and H. L. HALLER, 356

ADDINGTON, A. R., Relief Models, 160

Agricultural Exper. Sta., Conn., Semi-centennial, E. W.
ALLEN, 392

Agriculture, Funds for Research in, 152
Agronomy, Amer. Soc. of, Elections, 537

Alcohol, Pure Absolute, R. E. LYONS and L. T. SMITH,

224

ALEXANDER, W. H., Ohio Acad. of Sci., 60

Alfalfa, Root Rot of, L. W. DURRELL and W. G.
SACKETT, 82

ALLEN, E. W., Research in the Service of the State, 165,
Semi-centennial Conn. Agric. Experiment Station, 392
ALMY, F. F., Walter Scott Hendrixson, 197
American Association for the Advancement of Science,

Kansas City Meeting, B. E. LIVINGSTON, 48, 428, 469, 538; Annual Rept. of Permanent Secretary, B. E. LIVINGSTON, 467; Sect. Q, Education, 432; Executive Committee, B. E. LIVINGSTON, 443; Science Exhibit, 503; Sect. Zool., G. T. HARGITT, 504; Committee of One Hundred, R. H. TRUE, 559; Financial Rept. Pacific Div., W. W. SARGEANT, 572

Anatomy, Comparative, Terminology in, E. T. ENGLE, 328
ANDERSON, M. S., and S. E. MATTSON, Soil Colloids, 114
ANDERSON, R. J., Amer. Chem. Soc., Div. Biol. Chem., 137
Anthropology, Australian Commonwealth School of, 103
Antisepsis, Internal, V. LEONARD, 408
Anti-vivisection, 128

Aphid, Melon, Primary Food Plant of, E. M. PATCH, 510
Apple Varieties, Propagation of, C. F. SWINGLE, 544
Aquarium, Shedd, 322

Arboretum, National, F. V. COVILLE, 579

Arca patricia Sowerby, W. P. WOODRING, 518
Archeology, Amer., Antiquity Phantom in, W. H.
HOLMES, 256

ARMSTRONG, H. E., The Faraday Benzene Centenary, 39
ARNOLD, J. W., Effect of Noise on Hearing, 182
Artifacts, Human, in Pleistocene, H. J. Cook, 459
Astronomical Union, W. K. GREEN, 555
Atmometers, Porcelain, Porous, L. J. PESSIN, 85
Atomic Nuclei, Studies of, E. RUTHERFORD, 209

B., M. A., William Albert Hamilton, 214

Bacterial Disease of Tomato Fruits, N. A. BROWN, 12
Bacteriological Note on the Franklin Arctic Relief Ex-
pedition of 1848, N. MACL. HARRIS, 57
Bacteriophage, E. S. SANDERSON, 377
Bacterium Tumefaciens, M. LEVINE, 424

Bailey, C. H., Chemistry of Wheat Flour, H. W. WILEY, 511

Barro Colorado Island Laboratory, G. R. BISBY, 111
"Bar Sinister," R. HAWKSHURST, JR., 206
Basin Range Structure, S. TABER, 436

Bauman, J. E., From Trinil to New York, D. S. JORDAN, 113

Bauxite and Siderite, E. F. BURCHARD, 373
Bayliss, W. M., Physiology, R. S. LILLIE, 84
Beaver, Conservation of, by an Indian, H. I. SMITH, 461
Bees, Honey, A. C. BURRILL, 134; C. ROBERTSON, 287
BEHRE, E. H., The "Harmless" Coral Snake, 494
BELLING, J., Monocular Instruments, 54

Benzene, Faraday's Discovery of, 7, Centenary, H. E.
ARMSTRONG, 39
Bernouilli's Principle, W. S. FRANKLIN, R. F. DEIMEL,

397

BESSEY, E. A., Amer. Hungarian Foundation Library, 536

BIGELOW, H. B., Oceanic Circulation, 317

Bigelow, H. B. and W. W. Welsh, Fishes of the Gulf of Maine, J. T. NICHOLS, 207

Biological, Sciences, Nat. Research Fellowships in, F. R. LILLIE, 261; Literature in Paris, R. M. MAY, 203; Products, Standardization, Conference on, 321; Abstracts, J. R. SCHRAMM, 533

BISBY, G. R., Barro Colorado Island Laboratory, 111 BOOTHROYD, S. L., Research: A Retrospect, 1

Botanical, Criticism, P. B. SEARS, 371; Works, and Manuscripts, Abstracting, J. C. TH. UPHOF, 545 Botanists, American, Politeness of, J. H. KEMPTON, 158; C. H. FARR, 158

BRANT, I., The "Undertow," 30

BRAY, A. W. L., Distribution of Protozoan Genus, 589 BRENNEMAN, J. L., The Name "N" in cos NT, 222 BREWSTER, E. T., Evolution and the Bible, 159 British Association, 8, 128, 216

BROOKS, S. T., M. E. LARSON and M. H. VAN EPPS, Reaction of Opalinas to Laboratory Media, 289 BROWN, B., Luminous Spiders, 182, 329

BROWN, N. A., Bacterial Disease of Tomato, 12; Rot of Smyrna Fig, 288

BROWN, W. H., Tryparsamide, 350

BROWNE, C. A., History of the Beet, E. O. von Lipp

mann, 159; Early Chemistry, J. M. Stillman, 245 BRYAN, K., Channel Trenching in Arid Southwest, 338 Burbank, Luther, Plans for Experimental Farm, 238 BURCHARD, E. F., Bauxite and Siderite, 373 BURRILL, A. C., Honey Bees follow Wood Bees, 134

CADY, H. P. and R. TAFT, Electronation, 403
CAHN, A. R., Wisconsin State Park, 559

Calcium, Purpurin Method of localizing, A. B. MAC-
ALLUM, 511

CALDIS, P. D., Rot of the Smyrna Fig, 161
Cambridge, Univ. of, Degrees, 174

CAMPBELL, D. H., Wilhelm Hofmeister, 127
CARDIFF, I. D., Evolution and the Bible, 111

Carnegie, Corporation, Grants, 504, 539; Institute of Technology, Research Fellows, 199, Science Exhibit at, 583

Carter, Henry Rose, 320

CASTLE, W. E., Genetics, D. F. Jones, 567; E. W. Sinnott
and L. C. Dunn, 568; F. A. E. Crew, 568
Catalytic Action, Oxides of Iron in, L. A. WELO and O.
BAUDISCH, 311

Cathode Rays, High Voltage, W. D. COOLIDGE, 441

CAUSEY, D., Protozoa for Class Use, 113

Chandler, Memorial Meeting, 488; The Teacher and the
Chemist, M. I. PUPIN, 499; and the Columbia School
of Mines, G. B. PEGRAM, 501

Chemical, Soc., Amer., Hist. of Chem., L. C. NEWELL, 16;
Div. of Chem. Educ., 89; Div. Biol. Chem., R. J. AN-
DERSON, 137; Los Angeles Meeting, H. E. HOWE, 187;
F. C. WHITMORE, Div. Org. Chem. and Med. Products,
226; News Service, H. E. HOWE, 238; N. Y. Intersec-
tional Meeting, 281; Abstracts, E. J. CRANE, 46; In-
dustries, Exposition of, 260; Industry, German, 151
Chemistry, Div. of, Bureau of Standards, Chief of, 414;
Visiting Professorship at Cornell Univ., 560
Chemists, Organization in the U. S., C. E. MUNROE, 313
CHRISTIAN, H. A., Medical Investigation and Education,
551

Citations, Simplified Literature, E. D. MERRILL, 419
Civilization, Inst. for History of, P. E. GODDARD, 451
Clarke, John Mason, C. SCHUCHERT and R. RUEDEMANN,
117, C. D. WALCOTT, 558
Climatology, Congress of, 302

Clionidae, The Family, T. D. A. COCKERELL, 567
COCKERELL, T. D. A., Science and Social Ethics, 236;
Fossil Fish of the Family Callichthyidae, 397; Illit-
eracy in the Colleges, 510; The Family Clionidae, 567
Cod Liver Oil, Photochemistry of, E. S. WEST and G. H.
BISHOP, 86; Ultra-violet Light and the Oxidation of,
F. DANIELS and R. J. FOSBINDER, 266
COLE, E. C., Nephrostomes in the Earthworm, 50
COLE, W. H., and D. POTTER, Spongilla Lacustris in
Massachusetts, 206

COLEMAN, L. V., Museums, Organized, 148; Small, 458
Colloid Symposium, Third National, 25

Colors for Traffic Signals, 75

CONKLIN, E. G., The Cell, E. B. Wilson, 52; Marine Bio-
logical Laboratory, 276

Continent, Pacific, G. D. HANNA, 491

Cook, H. J., Human Artifacts in American Pleistocene,
459

COOLIDGE, W. D., High Voltage Cathode Rays, 441
Cooperation, Intellectual, Int. Inst. of, 391
Cosmology, W. D. MACMILLAN, 63, 96, 121
COVILLE, F. V., A National Arboretum, 579
COWDRY, E. V., Medical Research in China, 374
CRAIG, W., The "Undertow, 30

CRANE, C. R., Marine Biological Laboratory, 271
CRANE, E. J., Index to Chemical Abstracts, 46
Crew, F. A. E., Genetics, W. E. CASTLE, 568

Crown Gall and Nursery Stock, A. J. RIKER and G. W.
KEITT, 184

CUNNINGHAM, B., N. C. Acad. of Sci., 37

DALY, R. A., C. PALACHE and K. F. MATHER, Jay
Backus Woodworth, 450

DANIELS, F., and R. J. FOSBINDER, Ultra-violet Light and
the Oxidation of Cod Liver Oil, 266
Darling, Samuel Taylor, R. W. HEGNER, 23

DAVIS, W., Scientific Men and the Defense of Mr. Scopes,
130

DAVIS, W. M., "Undertow," 33; The Stewart Bank, 401
DE BAUFRE, W. L., Mechanical Power, 381
DEIMEL, R. F., Bernouilli's Principle, 397
DELAUNAY, L., S-chromosomes, 15
DEMAREE, R. G., Time Measurements, 245

DENSMORE, F., Music of the American Indians, 565
Depressor Principle, Separation of, from the Hepatic Tis-
sue, A. A. JAMES, N. B. LAUGHTON and A. B. MAC-
ALLUM, 181

DEXTER, J. S., Anti-evolution Propaganda in Ga., 399
DICE, L. R., Michigan Academy of Science, 58
DICKSON, B. T., Tobacco and Tomato Mosaic, 398
DIETZ, H. F., Indiana Academy of Science, 62

Digestion in Paramecia, P. G. SHIPLEY and C. F. DE-
GARIS, 266

Discussion and Correspondence, 12, 30, 50, 81, 108, 133,
157, 180, 203, 220, 243, 265, 286, 307, 326, 350, 371,
397, 418, 436, 458, 491, 509, 543, 565, 587
Disease, H. B. ENGLISH, 13

Diseases of the Ruffed Grouse, A. O. GROSs, 55
Distemper, Canine, Etiology of, R. G. GREEN, 133
Doctorates conferred by American Universities, C. HULL
and C. J. WEST, 578

DUNN, E. R., The "Harmless" Coral Snake, 308
DURAND, W. F., The Engineer and Civilization, 525
DURRELL, L. W., and W. G. SACKETT, Root Rot of Alfalfa,

82

Earth, Constitution of the, H. LAMB, 229
Earthquakes, Superficial Factors in, R. W. SAYLES, 299
Earthworm, Nephrostomes in, E. C. COLE, 50
Earthworms, G. E. GATES, 13

ECKART, C., Conservation of Momentum, 265
Eclipse, Total, 1926, R. W. MARRIOTT, 303
Edwards, Vinal Nye, Memorial to, 365

Eggs, supposed to be Luminous, A. H. GODBEY, 460
Electrical, Science, Law, Description and Hypothesis,
M. I. PUPIN, 17; Engineers, Amer. Inst., 24, 175;
Engineering at Mass. Inst. Tech., 345
Electrochemical Soc., Amer., Meeting, 199
Electrode, Hydrogen, C. P. SIDERIS, 331
Electronation, H. P. CADY and R. TAFT, 403

Energy, Conservation of, Bernouilli's Principle as, E. H.
KENNARD, 243

Engineer and Civilization, W. F. DURAND, 525
Engineering Soc., Illuminating, 239

Engineers, Mechanical, Amer. Soc. of, 432

ENGLE, E. T., Terminology in Comparative Anatomy, 328
ENGLISH, H. B., Disease, 13

Enzyme, Fungus, Nutritional Study of, G. W. HERVEY,
247

Eugenics, International Commission of, 259

Evolution, and Education, H. F. OSBORN, 43, 52; and
the Bible, I. D. CARDIFF, 111; A. F. WOODS, 159; E. T.
BREWSTER, 159; in the Physical World, G. F. HULL,
180; Dr. Riley on, R. R. HUESTIS, 220; anti, Propaga-
tion in Georgia, J. S. DEXTER, 399

Exner, F. M., Dynamische Meteorologie, A. MCADIE, 399
Expedition, to the Revillagigedo Islands, M. E. Mc-
LELLAN, 171; Asiatic, of Amer. Museum of Natural
History, 198; Paleontological, of Field Museum to
Argentina, E. S. RIGGS, 215; Norwegian, to Spitz-
bergen and Bear Island, 486

Expeditions, Russian Scientific, 237

F., H. L., American Geology, G. P. Merrill, 421
Faraday, Discovery of Benzene, 7; Centenary, H. E.
ARMSTRONG, 39

FARR, C. H., Politeness of American Botanists, 158
Fauna Hawaiiensis, H. E. GREGORY, 52

FINDLAY, A., The Twilight Zone of Matter, 192; Appeal
of Science to the Community, 357

Fish, Fossil, of the Family Callichthyidae, T. D. A.
COCKERELL, 397

FORBES, A., Analyzed Sound, 204

Forestry, Report of National Academy on, 5; Interna-
tional Congress, 216

FRANKLIN, W. S., Bernouilli's Principle, 397; Physics,
M. Planck, 438

Fungi, Virulence in, C. D. LARUE, 205

FUNK, C., Nomenclature of the Vitamines, 157

GAGER, C. S., André Parmentier, 461

GARRISON, F. H., Der Pathologisch-Anatomischen Ab-
bildung, E. Goldschmid, 545

Gaseous Catalysis, S. C. LIND and D. C. BARDWELL, 593
Gastric Transplantation, M. H. POWELSON, 247
GATES, G. E., Earthworms, 13

VOL. LXII

Geological, Conference in Western Texas, 413; Excursion
of N. Y. Colleges, 431

Geologists, Assoc. Amer. State, M. M. LEIGHTON, 452
Geology, Orton Memorial Library of, 47
German Museum of Applied Science, 74
Glacial Controversy, M. MANSON, 212
Glaciation, Tertiary, C. J. HARES, 308

GODBEY, A. H., Eggs supposed to be Luminous, 460
GODDARD, P. E., Civilization, 451

Goldschmid, E., Der Pathologisch-Anatomischen Ab-
bildung, F. H. GARRISON, 545

GORTNER, R. A. and W. F. HOFFMAN, Binding of Acid
and Alkali by Proteins, 464

Grafts, Nursery, R. H. ROBERTS, 356

Gray, Asa, B. L. ROBINSON, 45; Prof. Robinson's Tribute
to, H. W. WILEY, 222

GREEN, R. G., Etiology of Canine Distemper, 133
GREEN, W. K., Astronomical Union, 555

Green River Formation, N. E. A. HINDS, 34
GREGORY, H. E., Fauna Hawaiiensis, 52

GRINNELL, J., Wild Life Preservation, 437

GROSS, A. O., Diseases of the Ruffed Grouse, 55
GUNDERSEN, A., International List of Genera of Culti-
vated Plants, 589

Haas, A., Physics, J. R. NEILSEN, 495

HALL, M. C., Brayton Howard Ransom, 319
Hamilton, William Albert, M. A. B., 214

HANCE, R. T., Combined Culture Medium and Indicator
for Paramoecium, 351

HANNA, G. D., A Pacific Continent, 491
HARES, C. J., Tertiary Glaciation, 308

HARGITT, G. T., Sect. of Zool. of Amer. Assoc., at Kansas
City, 504

HARRIS, N. MACL., Bacteriological Note on the Franklin
Arctic Relief Expedition of 1848, 57

HARTSOUGH, R. C., A Duplex Vacuum Gauge, 160
Harvard University, Gifts to, 75; Medical School Dormi-
tories, 174; Awards from Milton Fund, 346
HAWKSHURST, R., JR., "Bar Sinister," 206
HAZELTINE, L. A., The Name "N" in Cos NT, 134;
Campbell's Definitive Units, 244

Health, Activities of the Government, J. A. TOBEY, 448;
Public, C.-E. A. WINSLOW, 335

HEILBRUNN, L. V., Interpretation of Biological Processes,
268

HELMICK, P. S., Iowa Academy of Science, 248

HEMINGER, I. M., Sex Changes in Birds, 398

Hendrixson, Walter Scott, F. F. ALMY, 197

Henry, Joseph, C. D. WALCOTT, 405

Heraldry, Error in, H. LEFFMAN, 33

HERVEY, G. W., Nutritional Study upon a Fungus En-
zyme, 247

HIBBARD, P. L., Plants on a Culture Solution, 515
HILTON, W. A., Nervous System of Insects, 372
HINDS, N. E. A., The Green River Formation, 34
HITCHCOCK, A. S., Success in Science, 141

HITE, M. P., The "Undertow," 31

HOBBS, W. H., The Index Generalis, 373

Hofmeister, Wilhelm, D. H. CAMPBELL, 127

HOLMES, W. H., The Antiquity Phantom, 256
Hopkins Marine Station, 76

HOWARD, L. O., Polyembryony, 308; Walter David
Hunter, 430

HOWE, H. E., Regelation and Low Temperatures, 15;
Amer. Chem. Soc., Los Angeles, Meeting, 187; News
Service, 238

HOWELL, B. F., Gilbert Van Ingen, 101

HUESTIS, R. R., Dr. Riley on Evolution, 220

HUGHES, J. S., R. W. TITUS and J. M. MOORE, Ultra-
violet Light and Anti-rachitic Vitamin in the Hen's
Eggs, 492

HULL, C., and C. J. WEST, Doctorates conferred by
American Universities, 578

HULL, G. F., Evolution in the Physical World, 180

HULSE, E. P., Luminous Spiders, 329

Hunter, Walter David, L. Ō. HOWARD, 430
Hydrogen, Atomic, Flames of, I. LANGMUIR, 463
Hydrogen-Magnesium Halides, R. M. PICKENS, 226
Hydroid of Craspedacusta Ryderi in Ky., F. PAYNE, 421
Hygiene, Mental, Lectures, 453

Illiteracy in the Colleges, T. D. A. COCKERELL, 510
Immunity, Specific, of the Tissues, E. C. PRENTISS, 91;
Tuberculosis, D. RIESMAN, 351

Immunization, Experimental, H. SEWALL, 293
Index Generalis, W. H. HOBBS, 373

Indiana Academy of Science, H. F. DIETZ, 62
Indians, American, Music of, F. DENSMORE, 565
Injection Apparatus, Air Pressure, E. L. LAZIER, 310
Insulin, J. J. ABEL, E. M. K. GEILING, G. ALLES and A.
RAYMOND, 169; Inactivation of, J. R. MURLIN, 332
Intellectual Leadership of the Times, the Post and the
Transcript, 223

International Physical Union, 129

Ionized Organic Gases, S. C. LIND and D. C. BARDWELL,

422

Ions, Hydrophilic Effects of, D. T. MACDOUGAL and B. L.
CLARKE, 136; Positive, New Source of, C. H. KUNS-
MAN, 269

Iowa Academy of Science, P. S. HELMICK, 248

JACKSON, R. C., Mackerel and Planktonic Organisms, 544
JAMES, A. A., N. B. LAUGHTON and A. B. MACALLUM,
Separation of the Depressor Principle from the Hepatic
Tissue, 181

JEFFREY, E. C., Mutation Hypothesis and Drosophila, 3;
Kohlenpetrographie, R. Potonié, 112

JOFFE, J. S., and H. C. MCLEAN, Suction of Soils, 548
John Scott Medal Fund, 99

Johnson, D., N. E. Acadian Shore Line, K. F. MATHER,
591

Jones, D. F., Genetics, W. E. CASTLE, 567

JORDAN, D. S., The Art of Pluviculture, 81; From Trinil
to New York, J. E. Bauman, 113; Allan Riverston Mc-
Culloch, 301; Underworld of Science, 326; Hodmen of
Science, 425

KEEN, W. W., "The Scientific Accuracy of the Sacred
Scriptures,
543

KELLOGG, V., English Support of Science, 412
KEMPTON, J. H., Politeness of American Botanists, 158
KENNARD, E. H., Bernouilli's Principle as Conservation
of Energy, 243

Kiær, J., Fauna of Norway, G. G. SIMPSON, 288

Kidney Function, H. L. WHITE and F. O. SCHMITT, 334
KLINE, J. J., An Unusual Meteor, 352

KLOOSTER, H. S. VAN, Nobel Prizes, 259

KNIGHT, A. P., Distribution of Trout Fry, 590

KNUDSEN, V. O., Hearing in Presence of Noise, 109
KUGELMASS, I. N., and I. MCQUARRIE, Changes in Photo-
graphic Plate by Antirachitic Substances, 87

KUNSMAN, C. H., New Source of Positive Ions, 269
KUSHNER, I., and A. S. CHAIKELIS, Action of Oxidases
by Bacteria, 36

Lacustris, Spongilla, W. H. COLE and D. POTTER, 206
LAIRD, D. A., and T. MCCLUMPHA, Sex Differences, 292
LAMB, H., Constitution of the Earth, 229

LAMB, M. U., W. H. SNELL and N. O. HOWARD, Moisture
Contents of Wood and its Decay, 377
LANGMUIR, I., Flames of Atomic Hydrogen, 463
LARSON, M. E., M. H. VAN EPPS and S. T. BROOKS, Re-
action of Opalinas to Laboratory Media, 289
LARUE, C. D., Virulence in Fungi, 205

LAZIER, E. L., Air Pressure Injection Apparatus, 310
LEAKE, C. D., Cooperative Research, 251
LEERSUM, E. C. VAN, Nomenclature of Vitamines, 494
LEFFMAN, H., Error in Heraldry, 33

LEIGHTON, M. M., Assoc. Amer. State Geologists, 452

LEONARD, V., Internal Antisepsis, 408

LEVENE, P. A., and H. L. HALLER, B-Oxybutyric and Lactic Acid, 356; and B. J. C. VAN DER HOEVEN, Growthpromoting Principle of Yeast, 594 LEVINE, M., Bacterium Tumefaciens, 424 Library, American-Hungarian Foundation, E. A. BESSEY, 536

LILLIE, F. R., Nat. Research Fellowships, 261; Address of the Director of the Marine Biological Laboratory, 272

LILLIE, R. S., Physiology, W. M. Bayliss, 84

LIND, S. C., and D. C. BARDWELL, Ionized Organic Gases, 422; Gaseous Catalysis, 593

LINTON, E., O. C. March and Pithecanthropus, 51 Lippmann, E. O. von, History of the Beet, C. A. BROWNE,

159

LITTLE, N. C., Text-books of Physics, 286

LIVINGSTON, B. E., Kansas City Meeting of Amer. Assoc., 48, 428, 469, 503, 538; Annual Report, 467; Executive Committee, 443

Loess, The Definition of, J. L. TILTON, 83
LOEVENHART, A. S., Tryparsamide, 587

LOOMIS, F. B., The Florida Man, 436

Luminescence in Sponges, Y. K. OKADA, 566

LUSK, G., Telephone Communication, C. A. Wright and A. F. Puchstein, 329

LYONS, R. E., and L. T. SMITH, Pure Absolute Alcohol, 224

MCADIE, A., Exner's Dynamische Meteorologie, 399;

Smithsonian Weather Forecasts, 418; Climates of the U. S., R. DeC. Ward, 462

MACALLUM, A. B., Purpurin Method of localizing Calcium, 511

McCulloch, Allan Riverston, D. S. JORDAN, 301

MACDOUGAL, D. T., and B. L. CLARKE, Hydrophilic Effect
of Ions on Agar and Protoplasmic Components, 136
MACDOUGALL, F. H., Surface Tension, 290
Mackenzie Park as a Field for Survey, Exploration,
Literature and Art, H. I. SMITH, 211

Mackerel and Planktonic Organisms, R. C. JACKSON, 544
MCKIBBEN, P. S., Royal Society of Canada, 162
MCLELLAN, M. E., Expedition to the Revillagigedo Is-
lands, 171

MACMILLAN, W. D., Cosmology, 63, 96, 121
Madagascar, Field Museum Expedition to, 366
Magnetic Declination, L. S. TAYLOR, 516

Males, Diploid, in Hymenoptera, P. W. WHITING and
A. R. WHITING, 437

Man, Florida, F. B. LOOMIS, 436

MANSON, M., The Glacial Controversy, 212

Marine Biological Laboratory, New Building, 26; C. R. CRANE, 271; F. R. LILLIE, 272; E. B. WILSON, 275; E. G. CONKLIN, 276

MARQUETTE, W., Ultra-violet Microscope, 135 MARRIOTT, R. W., Total Solar Eclipse of 1926, 303 Mathematical, Aspects of Cosmology, W. D. MACMILLAN, 63, 96, 121; Soc., Amer., R. G. D. RICHARDSON, 379, 550

Mathematics, the History of, Arithmetization in, G. A. MILLER, 328

MATHER, K. F., N. E. Acadian Shore Line, D. Johnson, 591

Matter, Twilight Zone of, A. FINDLAY, 192
MAY, R. M., Biological Literature in Paris, 203
Measurements, Time, R. G. DEMAREE, 245
Media, Laboratory Reaction of Opalinas to, M. E.
LARSON, M. H. VAN EPPS and S. T. BROOKS, 289
Medical, Center, Columbia-Presbyterian, 321; Lane Lec-
tures at Stanford, 413; Investigation and Education,
H. A. CHRISTIAN, 551

Medicine, Well-trained Practitioners, E. H. OCHSNER,

573

MELTON, F. A., Continents and Oceans, A. Wegener, 14 MERRILL, E. D., Simplified Literature Citations, 419

Merrill, G. P., American Geology, H. L. F., 421
METCALF, H., Free Living Nematodes, 245
Meteor, Unusual, J. J. KLINE, 352
Metric Association, H. RICHARDS, 164

Michigan Academy of Science, L. R. DICE, 58
Microchemical Test for Calcium, Macallum's, M. M.
SAMPSON, 400

Micro-organisms, Reproduction, C. H. WERKMAN, 115 Microscope, Ultra-violet, W. MARQUETTE, 135

MILLER, G. A., Arithmetization in the History of Mathematics, 328

MILLIKAN, R. A., High Frequency Rays of Cosmic Origin, , 461

445

"Millikan Rays,'

Momentum, Conservation of, C. ECKART, 265
Monocular Instruments, J. BELLING, 54

Mosaic, Tobacco, M. MULVANIA, 37; and Tomato, B. T.
DICKSON, 398

MUNROE, C. E., Organization of Chemists in U. S., 313 MURLIN, J. R., Inactivation of Insulin by Glucose, 332 Museums, Organized, L. V. COLEMAN, 148; Small, L. V. COLEMAN, 458

Music of the American Indians, F. DENSMORE, 565 Mutation Hypothesis and Drosophila, E. C. JEFFREY, 3

Name N in Cos NT, W. W. SLEATOR, 134; L. A. HAZEL-
TINE, 134; J. L. BRENNEMAN, 222

National Academy of Sciences, Report on Forestry, 5;
Abstracts of Papers, 519, Funds for, 582
Natural History, Peking Society of, 452
Necrosis, Potato, E. S. SCHULTZ, 571
Nematodes, Free Living, M. METCALF, 245
Nervous System of Insects, W. A. HILTON, 372
NEWELL, L. C., Amer. Chem. Soc., 16

Nichols, Harold William, 536

NICHOLS, J. T., Fishes of the Gulf of Maine, H. B.
Bigelow and W. W. Welsh, 207

NIELSEN, J. R., Physics, A. Haas, 495
Nobel Prizes, 487; H. S. VAN KLOOSTER, 259

Noise, Hearing in Presence of, V. O. KNUDSEN, 109;
Effect on Hearing, J. W. ARNOLD, 182

NORRIS, J. F., Address of President of the Amer. Chem. Soc., 189

Norris, J. F., Testimonial, 505

North Carolina, Academy of Science, B. CUNNINGHAM, 37 Nuttall, Thomas, W. H. POWERS, 389

Oceanic Circulation, H. B. BIGELOW, 317

OCHSNER, E. H., Practitioners of Medicine, 573
Ohio Academy of Science, W. H. ALEXANDER, 60
Oil Well, California, 366

OKADA, Y. K., Luminescence in Sponges, 566

OLITSKY, P., Tobacco and Tomato Mosaic Disease, 442 Optical Society of America, 322

OSBORN, H. F., Evolution and Education, 43

Osler Memorial Volume, 558

Oxidases, Retardation of the Action of by Bacteria, I. KUSHNER and A. S. CHAIKELIS, 36

Pan-Pacific, Science Congress, 73; Research Inst., 581 Paramoecium, Combined Culture Medium and Indicator for, R. T. HANCE, 351

Parasitologists, Amer. Soc. of, First Meeting, 391
Park, Wisconsin State, A. R. CAHN, 559
Parmentier, André, C. S. GAGER, 461
Parsons, Francis Henry, H. W. PIERSON, 344

PATCH, E. M., Primary Foodplant of Melon Aphid, 510
Paul to the Thessalonians, C. D. SNYDER, 33
PAYNE, F., Hydroid of Craspedacusta Ryderi, 421
PEGRAM, G. B., Chandler and the Columbia School of
Mines, 501

PEIRSON, M. B., N. California, Conference on Science
Teaching, 185

PESSIN, L. J., Porous Porcelain Atmometers, 85