NEWS shows the quantity of sulphuric acid, and is referred to 100 | THE SCIENTIFIC PUBLISHING CO. parts of the dried leather. Influence of Arsenic Acid upon the Vegetation of Algæ.-Raoul Bouilhac.-Stichococcus bacillaris Nagelii lives and reproduces itself in mineral solutions containing arsenic acid. Other Alga besides Stichococcus are able to vegetate in nutrient solutions containing arsenic acid. Under these conditions these Algæ are capable of assimi. lating arsenic acid. The addition of arsenic acid to a nutrient solution free from phosphoric acid causes the Algæ to flourish. In this case the arseniates can be substituted for the phosphates. Journal fur Praktische Chemie. New Series, Vol. 1., Nos. 9 and 10. Calorimetric Investigations.-F. Stohmann.-This 32nd paper on the thermic value of glycogen has been drawn up by the author in conjunction with R. Schmidt. The thermic value of glycogen per grm. is 4190 6 cal., that of cellulose being 4185'4, and that of starch 4182'5. Calorimetric Investigations.-F. Stohmann and H. Langbein.—In this paper the authors consider the thermic value of the isomeric acids of the composition CH6O3 and C8H8O3. The authors have already shown the incorrectness of the earlier view that isomers of similar constitution have an identical thermic value. They now enter upon a further examination of the same subject. On Derivatives of Auramine.-J. Finkh and M. Schwimmer. This paper extends to close upon 50 pages, and contains nothing which would warrant its insertion in toto. (Of NEW YORK and LONDON), MODERN AMERICAN METHODS OF COPPER SMELTING. By Dr. E. D. PETERS. Sixth Edition, 1894. Price 20s. Full of specially prepared Illustrations reproduced from working drawings, &c. "The utility of the book is beyond all question, and we feel confident that it will be welcomed by metallurgists on both sides of the Atlantic."-Chemical News. "The book is full of information and devoid of the ordinary text-book objections; it bears throughout the stamp of having been written by a practical man thoroughly up in his subject.”—Engineering. THE METALLURGY OF LEAD and the DESILVER ISATION OF BASE BULLION. By Dr. H. O. HOFMAN. Third Edition, 1893. Price 30s. Containing 275 specially prepared Illustrations reproduced from working drawings, &c. "As a complete epitome of recent practice in lead smelting this book will be gladly welcomed by the whole metallurgical world."— Industries. THE METALLURGY OF STEEL. BY HENRY M. HOWE, A.M., S.B. Third Edition, 1894. Price 50s. Full of Illustra tions specially prepared. "The work is simply enormous, unmatched in its minute and thoroughgoing comprehensiveness."-Chemical News. of this hyper-eminent work to our readers."—Stahl und Eisen. "We cannot refrain from most urgently recommending the study THE MINERAL INDUSTRY: Its Statistics, Technology, and Trade, in the United States and other Countries, from the Earliest Times, being the Annual Statistical Supplement of the Engineering and Mining Journal. Edited by RICHARD P. ROTHWELL. Price, Vol. I. for year 1892, 12s. 6d.; Vol. II. for year 1893, 255. This work is a " MINERAL ENCYCLOPEDIA"; never before were so many facts and figures collected together relating to the amount and cost of production, the geographical distribution, and the latest deand minerals. "This most useful work will meet with a large demand amongst miners, metallurgists, and consumers or dealers in metals."-Chemical News. Further Contributions to a Knowledge of the Re-velopments in the mining and metallurgy of all the principal metals duction Products of Solid a-Dichlorcyanethyl.-J. Traeger. This extensive memoir does not admit of useful abridgment. On the Atomic Weight of Bismuth.-R. Schneider. -The mean result of the author's six determinations is 208.05 (0=16). He considers that it will be perfectly justifiable to accept the round number 208. Reuniol, a New Terpene Alcohol.-A. Hesse.-This strangely-named compound is a product of the geranium oil obtained from the French colony, Reunion, formerly known as Bourbon. Its composition is C10H180, its boiling point is 225.5°-226°, its specific gravity (at 200o) is 0.865, and its optical rotation in a stratum of 100 m.m, +1° 45'. THE ENGINEERING AND MINING JOURNAL. (Weekly). Yearly subscription £1 8s. 9d. The recognised au thority on practical Mining and Metallurgy. Specimen copies sent on application. ETC., ETC. A complete Catalogue of Publications sent on application. E. & F. N. SPON'S PRACTICAL HANDBOOKS. GAS AS ENGINEERS' LABORATORY HANDBOOK. By JOHN HORNBY, F.I.C., Honours Medallist in Gas Manufacture, City and Guilds of London Institute. With 53 Illustrations. Crown 8vo., cloth, 6s. 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