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ADVERTISEMENT.

(Fourteenth Annual Keport.]

The publications of the United States Geological Survey are issued in accordance with the statuto approved March 3, 1879, which declares that

"The publications of the Geological Survey shall consist of the annual report of operations, geological and economic maps illustrating the resources and classification of the lands, and reports upon general and economic geology and paleontology. The annual report of operations of the Geological Survey shall accompany the annnal report of the Secretary of the Interior. All special memoirs and reports of said Survey shall be issued in uniform quarto series if deemed necessary by the Director, but otherwise in ordinary octavos. Three thousand copies of each shall be published for scientific exchanges and for sale at the price of publication; and all literary and cartographic materials received in exchange shall be the property of the United States and form a part of the library of the organization; and the money resulting from the sale of such publications shall be covered into the Treasury of the United States."

On July 7, 1882, the following joint resolution, referring to all Government publications, was passed by Congress :

"That whenever any document or report shall be ordered printed by Congress, there shall be printed, in addition to the number in each case stated, the usual number' (734) of copies for binding and distribution among those entitled to receive them."

Except in those cases in which an extra number of any publication has been supplied to the Survey by special resolution of Congress or has been ordered by the Secretary of the Interior, this office has no copies for gratuitous distribution.

ANNUAL REPORTS.

I. First Annual Report of the United States Geological Survey, by Clarence King. 1880. 89. 79 pp. 1 map.-A preliminary report describing plan of organization and publications,

II. Second Annual Report of the United States Geological Survey, 1880-'81, by J. W. Powell. 1882. 80. lv, 588 pp. 62 pl. 1 map.

III. Third Annual Report of the United States Geological Survey, 1881-'82, by J. W. Powell. 1883. 89. xviii, 564 pp. 67 pl. and maps.

IV. Fourth Annual Report of the United States Geological Survey, 1882–83, by J. W. Powell. 1884. 80. xxxii, 473 pp. 83 pl. and maps.

V. Fifth Annual Report of the United States Geological Survey, 1883–84, by J. W. Powell. 1885. 89. xxxvi, 469 pp. 58 pl. and maps.

VI. Sixth Annual Report of the United States Geological Survey, 1884-'85, by J. W. Powell. 1885. 89. xxix, 570 pp. 65 pl. and maps.

VII. Seventh Annual Report of the United States Geological Survey, 1885-'86, by J. W. Powell. 1888. 80. xx, 656 pp. 71 pl. and maps.

VIII. Eighth Annual Report of the United States Geological Survey, 1886-'87, by J. W. Powell. 1889. 89. 2 pt. xix, 474, xii pp. 53 pl. and maps; 1 p. 1., 475–1063 pp. 54-76 pl. and maps.

IX. Ninth Annual Report of the United States Geological Survey, 1887-'88, by J. W. Powell. 1889. 80. xiii, 717 pp. 88 pl. and maps.

X. Tenth Annual Report of the United States Geological Survey, 1888-'89, by J. W. Powell. 1890. 8?. 2 pt. xv, 774 pp. 98 pl. and maps; viii, 123 pp.

XI. Eleventh Annual Report of the United States Geological Survey, 1889-'90, by J. W. Powell. 1891. 8o. 2 pt. xv, 757 pp. 66 pl. and maps; is, 351 pp. 30 pl.

XII. Twelfth Annual Report of the United States Geological Survey, 1890-'91, by J. W. Powell. 1891. 80. 2 pt. xiii, 675 pp. 53 pl. and maps; xviii, 576 pp. 146 pl. and maps.

XIII. Thirteenth Annual Report of the United States Geological Survey, 1891-'92, by J. W. Powell, 1893. 89. 3 pt. vii, 210 pp. 2 pl.

XIV. Fourteenth Annual Report of the United States Geological Survey, 1892-93, by J. W.Powell, 1893. 80. 2 pt.

MONOGRAPHS.

I. Lake Bonneville, by Grove Karl Gilbert. 1890. 49. XX, 438 pp. 51 pl. 1 map. Price $1.50.

II. Tertiary History of the Grand Canon District, with atlas, by Clarence E. Dutton, Capt. U. S. A. 1882. 4o. xiv, 264 pp. 42 pl. and atlas of 24 sheets folio. Price $10.00.

III. Geology of the Comstock Lode and the Washoe District, with atlas, by George F. Becker. 1882. 4o. xv, 422 pp. 7 pl. and atlas of 21 sheets folio. Price $11.00.

IV. Comstock Mining and Miners, by Eliot Lord. 1883. 4o. xiv, 151 pp. 3 pl. Price $1.50.

V. The Copper-Bearing Rocks of Lake Superior, by Roland Duer Irving. 1883. 4o. xvi, 464 pp. 151. 29 pl. and maps. Price $1.85.

VI. Contributions to the Knowledge of the Older Mesozoic Flora of Virginia, by William Morris Fontaine. 1883. 4o. xi, 144 pp. 54 1. 54 pl. Price $1.05.

VII. Silver-Lead Deposits of Eureka, Nevada, by Joseph Story Curtis. 1881. 4o. xiii, 200 pp. 16 pl. Price $1.20.

VIII. Paleontology of the Eureka District, by Charles Doolittle Walcott. 1884. 4o. xiii, 298 p. 241. 24 pl. Price $1.10.

IX. Brachiopoda and Lamellibranchiata of the Raritan Clays and Greensand Marls of New Jersey, by Robert P. Whitfield. 1885. 40. XX, 338 pp. 35 pl. 1 map. Price $1.15. · X. Dinocerata. A Monograph of an Extinct Order of Gigantic Mammals, by Othniel Charles Marsh. 1886. 4o. xviii, 243 pp. 56 l. 56 pl. Price $2.70.

XI. Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Nevada, by Israel Cook Russell. 1885. 4o. xiv, 288 pp. 46 pl. and maps. Price $1.75.

XII. Geology and Mining Industry of Lead ville, Colorado, with atlas, by Samuel Franklin Emmons. 1886. 40. xxix, 770 pp. 45 pl. and atlas of 35 sheets folio. Price $8.40.

XIII. Geology of the Quicksilver Deposits of the Pacific Slope, with atlas, by George F. Becker, 1888. 4o. xix, 486 pp. 7 pl. and atlas of 14 sheets folio. Price $2.00.

XIV. Fossil Fishes and Fossil Plants of the Triassic Rocks of New Jersey and the Connecticut Val. ley, by John S. Newberry. 1888. 40. xiv, 152 pp. 26 pl. Price $1.00.

XV. The Potomac or Younger Mesozoic Flora, by William Morris Fontaine. 1889. 40. xiv, 377 pp. 180 pl. Text and plates bound separately. Price $2.50.

XVI. The Paleozoic Fishes of North America, by John Strong Newberry. 1889. 49, 340 pp. 53 pl. Price $1.00.

XVII, The Flora of the Dakota Group, a posthumous work, by Leo Lesquereux. Edited by F. H. Knowlton. 1891. 40. 400 pp. 66 pl. Price $1.10.

XVIII. Gasteropoda and Cephalopoda of the Raritan Clays and Greensand Marls of New Jersey, by Robert P. Whitfield. 1891. 40. 402 pp. 50 pl. Price $1.00.

XIX. The Penokee Iron-Bearing Series of Northern Wisconsin and Michigan, by Roland D. Irving and C. R. Van Hise. 1892. 4o. xix, 534 pp. 37 pl.

XX. Geology of the Eureka District, Nevada, with atlas, by Arnold Hague. 1892. 40. 419 pp. 8 pl.

In press:
XXI. The Tertiary Rhyncbophorous Coleoptera of North America, by Samuel Hubbard Scudder.
XXII. A Manual of Topographic Methods, by Henry Gannett, chief topographer.
XXIII. Geology of the Green Mountains in Massachusetts, by Raphael Pumpelly, J. E. Wolff,
T. Nelson Dale, and Bayard T. Putnam.
In preparation:

- Mollusca and Crustacea of the Miocene Formations of New Jersey, by R. P. Whitfield.
- Sauropoda, by 0. C. Marsh.
- Stegosauria, by 0. C. Marsh.
- Brontotheridæ, by 0. C. Marsh.
- Report on the Denver Coal Basin, by S. F. Emmons.
- Report on Silver Cliff and Ten-Mile Mining Districts, Colorado, by S. F. Emmons.
- The Glacial Lake Agassiz, by Warren Upham.

BULLETINS.

1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with a Geological Sketch of Buffalo Peaks, Colorado, by S. F. Emmons. 1883. 89. 42 pp. 2 pl. Price 10 cents.

2. Gold and Silver Conversion Tables, giving the coining values of troy ounces of fine metal, etc., com puted by Albert Williams, jr. 1883. 8. 8 pp. Price 5 cents.

3. On the Fossil Faunas of the Upper Devonian, along the meridian of 76° 30', from Tompkins County, New York, to Bradford County, Pennsylvania, by Henry S. Williams. 1884. 80. 36 pp. Price 5 cents.

4. On Mesozoic Fossils, by Charles A. White. 1884. 80. 36 pp. 9 pl. Price 5 cents. 5. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 18-4. 80. 325 pp. Price 20 cents.

6. Elevations in the Dominion of Canada, by J. W. Spencer, 1884. 80. 43 pp. Price 5 cants.

7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America (North and South), 1752-1881, in geographic and chronologic order, by Jules Marcou and John Belknap Marcon. 1884. 80. 184 pp. Price 10 cents.

8. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C. R. Van Hise. 1884. 89. 56 pp. 6 pl. Price 10 cents.

9. A report of work done in the Washington Laboratory during the fiscal year 1883-'84. F. W. Clarke, chief chemist. T. M. Chatard, assistant chemist. 1884. 80. 40 pp. Price 5 cents.

10. On the Cambrian Faunas of North America. Preliminary studies, by Charles Doolittle Walcott. 1884. 80. 74 pp. 10 pl. Price 5 cents.

11. On the Quaternary and Recent Mollusca of the Great Basin; with Descriptions of New Foring. by R. Ellsworth Call. Introduced by a sketch of the Quaternary Lakes of the Great Basin, by G. K. Gilbert. 1884. 8°. 66 pp. 6 pl. Price 5 cents.

12. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward S. Dana. 1884. 8o. 34 pp. 3 pl. Price 5 cents.

13. Boundaries of the United States and of the several States and Territories, with a Historical Sketch of the Territorial Changes, by Henry Gannett. 1885. 8° 135 pp. Price 10 cents.

14. The Electrical and Magnetic Properties of the Iron-Carburets, by Carl Barus and Vincent Strouhal. 1883. 8. 238 pp. Price 15 cents.

15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 80. 33 pp. Price 5 cents.

16. On the Higher Devonian Faunas of Ontario County, New York, by John M. Clarke. 1885. 8o. 86 pp. 3 pl. Price 5 cents.

17. On the Development of Crystallization in the Igneous Rocks of Washoe, Nevada, with notes on the Geology of the District, by Arnold Hague and Joseph P. Iddings. 1885. 89. 44 pp. Price 5 cents.

18. On Marine Eocene, Fresh-water Miocine, and other Fossil Mollusca of Western North America, by Charles A. White. 1885. 8o. 26 pp. 3 pl. Price 5 cents.

19. Notes on the Stratigraphy of California, by George F. Becker. 1885. 8o. 28 pp. Price 5 cents.

20. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W.F. Hillebrand. 1885. go. 114 pp. 1 pl. Price 10 cents.

21. The Lignites of the Great Sioux Reservation. A Report on the Region between the Grand and Moreau Rivers, Dakota, by Bailey Willis. 1885. 80. 16 pp. 5 pl. Price 5 cents.

22. On New Cretaceous Fossils from California, by Charles A. White. 1885. 80. 25 pp. 5 pl. Price 5 cents.

23. Observations on the Junction between the Eastern Sandstone and the Keweenaw Series on Ke. weenaw Point, Lake Superior, by R. D. Irving and T. C. Chamberlin. 1885. 8o. 124 pp. 17 pl. Price 15 cents.

24. List of Marine Mollusca, comprising the Quaternary Fossils and recent forms from American Localities between Cape Hatteras and Cape Roque, including the Bermudas, by William Healy Dall. 1885. 8o. 336 pp. Price 25 cents.

25. The Present Technical Condition of the Steel Industry of the United States, by Phineas Barnes. 1885. 80. 85 pp. Price 10 cents.

26. Copper Smelting, by Henry M. Howe. 1885. 80. 107 pp. Price 10 cents. 27. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 1884–85. 1886. 89. 80 pp. Price 10 cents.

28. The Gabbros and Associated Hornblende Rocks occurring in the neighborhood of Baltimore, Md., by George Huntington Williams. 1886. 8o. 78 pp. 4 pl. Price 10 cents.

29. On the Fresh-water Invertebrates of the North American Jurassic, by Charles A. White. 1886. 80. 41 pp. 4 pl. Price 5 cents.

30. Second Contribution to the Studies on the Cambrian Faunas of North America, by Charles Doo. little Walcott. 1886. 89. 369 pp. 33 pl. Price 25 cents.

31. Systematic Review of our Present Knowledge of Fossil Insects, including Myriapods and Arach. nids, by Samuel Hubbard Scudder. 1886. 8o. 128 pp. Price 15 cents.

32. Lists and Analyses of the Mineral Springs of the United States; a Preliminary Study, by Albert C. Peale. 1886. 8o. 235 pp. Price 20 cents.

33. Notes on the Geology of Northern California, by J.S. Diller. 1886. 89. 23 pp. Price 5 cents.

34. On the relation of the Laramie Molluscan Fauna to that of the sncceeding Fresh-water Eocene and other groups, by Charles A. White. 1886. 80. 54 pp. 5 pl. Price 10 cents.

35. Physical Properties of the Iron-Carburets, by Carl Barus and Vincent Strouhal. 1886. 80. 62 pp. Price 10 cents.

36. Subsidence of Fine Solid Particles in Liquids, by Carl Barus. 1886. 80. 58 pp. Price 10 cents. 37. Types of the Laramie Flora, by Lester F. Ward. 1887. 80. 354 pp. 57 pl. Price 25 cents. 38. Peridotite of Elliott County, Kentucky, by J. S. Diller. 1887. 8o. 31 pp. 1 pl. Price 5 cents.

39. The Upper Beaches and Deltas of the Glacial Lake Agassiz, by Warren Upham. 1887. 80. 84 pp. 1 pl. Price 10 cents.

40. Changes in River Courses in Washington Territory due to Glaciation, by Bailey Willis. 1887. 8o. 10 pp. 4 pl. Price 5 cents.

MONOGRAPHS.

I. Lake Bonneville, by Grove Karl Gilbert. 1890. 49. XX, 438 pp. 51 pl. 1 map. Price $1.50.

II. Tertiary History of the Grand Cañon District, with atlas, by Clarence E. Dutton, Capt. U. S. A. 1882. 4o. xiv, 264 pp. 42 pl. and atlas of 24 sheets folio. Price $10.00.

III. Geology of the Comstock Lode and the Washoe District, with atlas, by George F. Becker. 1882. 40. XV, 422 pp. 7 pl. and atlas of 21 sheets folio. Price $11.00. IV. Comstock Mining and Miners, by Eliot Lord. 1883. 4o. xiv, 151 pp. 3 pl. Price $1.50.

V. The Copper-Bearing Rocks of Lake Superior, by Roland Duer Irving. 1883. 4o. xvi, 464 pp. 151. 29 pl. and maps. Price $1.85.

VI. Contributions to the Knowledge of the Older Mesozoic Flora of Virginia, by William Morris Fontaine. 1883. 4o. xi, 144 pp. 54 1. 54 pl. Price $1.05.

VII. Silver-Lead Deposits of Eureka, Nevada, by Joseph Story Curtis. 1884. 1o. xiii, 200 pp. 16 pl. Price $1.20.

VIII. Paleontology of the Eureka District, by Charles Doolittle Walcott. 1884. 4o. xiii, 298 p. 241. 24 pl. Price $1.10.

IX. Brachiopoda and Lamellibranchiata of the Raritan Clays and Greensand Marls of New Jersey, by Robert P. Whitfield. 1885. 40. XX, 338 pp. 35 pl. 1 map. Price $1.15. · X. Dinocerata. A Monograph of an Extinct Order of Gigantic Mammals, by Othniel Charles Marsh. 1886. 4o. xviii, 243 pp. 56 l. 56 pl. Price $2.70.

XI. Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Nevada, by Israel Cook Russell. 1885. 4o. xiv, 288 pp. 46 pl. and maps. Price $1.75.

XII. Geology and Mining Industry of Leadville, Colorado, with atlas, by Samuel Franklin Emmons. 1886. 4o. xxix, 770 pp. 45 pl. and atlas of 35 sheets folio. Price $8.40.

XIII. Geology of the Quicksilver Deposits of the Pacific Slope, with atlas, by George F. Becker, 1888. 4o. xix, 486 pp. 7 pl. and atlas of 14 sheets folio. Price $2.00.

XIV. Fossil Fishes and Fossil Plants of the Triassic Rocks of New Jersey and the Connecticut Val. ley, by John S. Newberry. 1888. 4o. xiv, 152 pp. 26 pl. Price $1.00.

XV. The Potomac or Younger Mesozoic Flora, by William Morris Fontaine. 1889. 4o. xiv, 377 pp. 180 pl. Text and plates bound separately. Price $3.50.

XVI. The Paleozoic Fishes of North America, by John Strong Newberry. 1889. 40. 340 pp. 53 pl. Price $1.00.

XVII. The Flora of the Dakota Group, a posthumous work, by Leo Lesquereux. Edited by F. H. Knowlton. 1891. 40. 400 pp. 66 pl. Price $1.10.

XVIII. Gasteropoda and Cephalopoda of the Raritan Clays and Greensand Marls of New Jersey, by Robert P. Whitfield. 1891. 4o. 402 pp. 50 pl. Price $1.00.

XIX. The Penokee Iron-Bearing Series of Northern Wisconsin and Michigan, by Roland D. Irving and C. R. Van Hise. 1892. 4o. xix, 534 pp. 37 pl.

XX. Geology of the Eureka District, Nevada, with atlas, by Arnold Hague. 1892. 4o. 419 pp. 8 pl.

In press :
XXI. The Tertiary Rhynchophorous Coleoptera of North America, by Samuel Hubbard Scudder.
XXII. A Manual of Topographic Methods, by Henry Gannett, chief topographer.
XXIII. Geology of the Green Mountains in Massachusetts, by Raphael Pumpelly, J. E. Wolff,
T. Nelson Dale, and Bayard T. Putnam.
In preparation:

-- Mollusca and Crustacea of the Miocene Formations of New Jersey, by R. P. Whitfield.
- Sauropoda, by 0. C. Marsh.
-- Stegosauria, by 0. C. Marsh.
- Brontotheridæ, by 0. C. Marsh.
- Report on the Denver Coal Basin, by S. F. Emmons.
- Report on Silver Cliff and Ten Mile Mining Districts, Colorado, by S. F. Emmons.
- The Glacial Lake Agassiz, by Warren Upham.

BULLETINS.

1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with a Geological Sketch of Buffalo Peaks, Colorado, by S. F. Emmons. 1883. 8°. 42 pp. 2 pl. Price 10 cents.

2. Gold and Silver Conversion Tables, giving the coining values of troy ounces of fine metal, etc., com puted by Albert Williams, jr. 1883. 89. 8 pp. Price 5 cents.

3. On the Fossil Faunas of the l'pper Devonian, along the meridian of 760 30', from Tompkins County, New York, to Bradford County, Pennsylvania, by Henry S. Williams. 1884. 80. 36 pp. Price 5 cents.

4. On Mesozoic Fossils, by Charles A. White. 1884. 89. 36 pp. 9 pl. Price 5 cents.

5. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 18-4. 8o. 325 pp. Price 20 cents.

6. Elevations in the Dominion of Canada, by J. W. Spencer. 1884. 80. 43 pp. Price 5 c«nts.

7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America (North and South), 1752-1881, in geographic and chronologic order, by Jules Marcou and John Belknap Marcou. 1884. 80. 184 pp. Price 10 cents.

8. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C. R. Van Hise. 1884. 80. 56 pp. 6 pl. Price 10 cents.

9. A report of work done in the Washington Laboratory during the fiscal year 1883-'84. F. W. Clarke, chief chemist. T. M. Chatard, assistant chemist. 1884. 80. 40 pp. Price 5 cents.

10. On the Cambrian Faunas of North America. Preliminary studies, by Charles Doolittle Walcott. 1884. 80. 74 pp. 10 pl. Price 5 cents.

11. On the Quaternary and Recent Mollusca of the Great Basin; with Descriptions of New Forms. by R. Ellsworth Call. Introduced by a sketch of the Quaternary Lakes of the Great Basin, by G. K. Gilbert. 1884. 8o. 66 pp. 6 pl. Price 5 cents.

12. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward S. Dana. 1884. 8°. 34 pp. 3 pl. Price 5 cents.

13. Boundaries of the United States and of the several States and Territories, with a Historical Sketch of the Territorial Changes, by Henry Gannett. 1885. 8o. 135 pp. Price 10 cents.

14. The Electrical and Magnetic Properties of the Iron-Carburets, by Carl Barus and Vincent Strouhal. 1883. 80 238 pp. Price 15 cents.

15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 80. 33 pp. Price 5 cents.

16. On the Higher Devonian Faunas of Ontario County, New York, by John M. Clarke. 1885. go. 86 pp. 3 pl. Price 5 cents.

17. On the Development of Crystallization in the Igneous Rocks of Washoe, Nevada, with notes on the Geology of the District, by Arnold Hagne and Joseph P. Iddings. 1885. 80. 44 pp. Price 5 cents.

18. On Marine Eocene, Fresh-water Miocune, and other Fossil Mollusca of Western North America, by Charles A. White. 1885. 89. 26 pp. 3 pl. Price 5 cents.

19. Notes on the Stratigraphy of California, by George F. Becker. 1885. 8o. 28 pp. Price 5 cents. 20. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W.F. Hillebrand. 1885. 89. 114 pp. 1 pl. Price 10 cents.

21. The Lignites of the Great Sioux Reservation. A Report on the Region between the Grand and Moreau Rivers, Dakota, by Bailey Willis. 1885. 8o. 16 pp. 5 pl. Price 5 cents.

22. On New Cretaceous Fossils from California, by Charles A. White. 1885. 80. 25 pp. 5 pl. Price 5 cents.

23. Observations on the Junction between the Eastern Sandstone and the Keweenaw Series on Ke. weenaw Point, Lake Superior, by R. D. Irving and T. C. Chamberlin. 1885. 89. 124 pp. 17 pl. Price 15 cents.

24. List of Marine Mollusca, comprising the Quaternary Fossils and recent forms from American Localities between Cape Hatteras and Cape Roque, including the Bermudas, by William Healy Dall. 1885. 8o. 336 pp. Price 25 cents.

25. The Present Technical Condition of the Steel Industry of the United States, by Phineas Barnes. 1885. 89. 85 pp. Price 10 cents.

26. Copper Smelting, by Henry M. Howe. 1885. 80. 107 pp. Price 10 cents.

27. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 1884–85. 1886. 89. 80 pp. Price 10 cents.

28. The Gabbros and Associated Hornblende Rocks occurring in the neighborhood of Baltimore, Md., by George Huntington Williams. 1886. 89. 78 pp. 4 pl. Price 10 cents.

29. On the Fresh-water Invertebrates of the North American Jurassic, by Charles A. White. 1886. 8o. 41 pp. 4 pl. Price 5 cents.

30. Second Contribution to the Studies on the Cambrian Faunas of North America, by Charles Doo. little Walcott. 1886. 8o. 369 pp. 33 pl. Price 25 cents.

31. Systematic Review of our Present Knowledge of Fossil Insects, including Myriapods and Arach. nids, by Samuel Hubbard Scudder. 1886. 8o. 128 pp. Price 15 cents.

32. Lists and Analyses of the Mineral Springs of the United States; a Preliminary Study, by Albert C. Peale. 1886. 80. 235 pp. Price 20 cents.

33. Notes on the Geology of Northern California, by J. S. Diller, 1886. 89. 23 pp. Price 5 cents.

34. On the relation of the Laramie Molluscan Fauna to that of the succeeding Fresh-water Eocene and other groups, by Charles A. White. 1886. 89. 54 pp. 5 pl. Price 10 cents.

35. Physical Properties of the Iron-Carburets, by Carl Barus and Vincent Strouhal. 1886. 80. 62 pp. Price 10 cents.

36. Subsidence of Fine Solid Particles in Liquids, by Carl Barus. 1886. 80. 58 pp. Price 10 cents. 37. Types of the Laramie Flora, by Lester F. Ward. 1887. 80. 354 pp. 57 pl. Price 25 cents. 38. Peridotite of Elliott County, Kentucky, by J. S. Diller. 1887. 8o. 31 pp. 1 pl. Price 5 cents.

39. The Upper Beaches and Deltas of the Glacial Lake Agassiz, by Warren Upham. 1887. 89. 84 pp. 1 pl. Price 10 cents.

40. Changes in River Courses in Washington Territory due to Glaciation, by Bailey Willis. 1887. 80. 10 pp. 4 pl. Price 5 cents.

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