SCIENCE-ADVERTISEMENTS iii 



The Depths of the Ocean 



By Sir JOHN MURRAY, K.C.B., F R.S., etc., of the "Challenger" Expedition, and Dr. JOHAN 

 HJORT, Director of the Norwegian Fisheries. With contributions from Professors A. Appellof, 

 H. H. Gran, and Dr. B. Helland-Hansen. 



A general account of the modern Science of Oceanography based largely on the scientific re- 

 searches of the Norwegian steamer "Michael Sars " in the North Atlantic during 1910. Hand- 

 somely illustrated with photographs, plates, maps, charts of the ocean depths, etc. Cloth, 8vo, 

 $7.60 net ; postpaid, S7.84. 



Meteorology 



By W. I. MILHAM, Professor of Astronomy in Williams College ; Author of " How to Iden- 

 tify the Stars," etc. This volume explains in clear, untechnical language the entire mechanism 

 controlling our ever changing weather, and is of especial value as a text-book in meteorological 

 courses. Cloth, 8vo, $4.50,; postpaid, $4.73. 



Earth Features and Their Meaning 



By WILLIAM HERBERT HOBBS, Professor of Geology in the University of Michigan ; 

 Author of " Characteristics of Existing Glaciers," etc. Places before the general reader and 

 student the geological meaning of landscapes, with an unusual number of appropriate illustra- 

 tions. Cloth, $3.00 net ; postpaid, $3.24- 



By the same Author. 



Characteristics of Existing Glaciers 



Illustrated by 34 plates and 140 text-figures. Cloth, Svo, $3.25 net ; postpaid, $3.47. 



College Zoology 



By ROBERT W. HEGNER, Ph.D., Assistant Professor of Zoology in the University of 

 Michigan. A text for students in universities and colleges or for the general reader who wishes 

 to gain a more comprehensive view of the animal world. Illustrated. Cloth, 12mo, $2.60 net ; 

 postpaid, $2.84- 



Methods of Organic Analysis 



By HENRY C. SHERMAN, Ph.D., Professor of Food Chemistry in Columbia University; 

 Author of " Chemistry of Food and Nutrition." The second edition, rewritten and enlarged. 

 Illustrated. Cloth, Svo, $2.40 net ; postpaid, $2.60. 



The Calculus 



By ELLERY WILLIAM DAVIS, Professor of Mathematics, University of Nebraska. An im- 

 portant work presenting as many and as varied applications of the Calculus as it is possible to do 

 without abandoning an orderly presentation of principles. Cloth, 12mo, S2.00net; postpaid, $2.18. 



A Treatise On Hydraulics 



By WILLIAM CAWTHORNE UNWIN, LL.D., F.R.S., Emeritus Professor of the City and 

 Guilds (Engineering) College, M. Inst. Civil Engineers, Hon. M. Inst, of Mechanical Engineers, 

 Foreign Hon. M. Am. Academy of Arts and Sciences, M. Inst, of Electrical Engineers. Cloth, 

 Svo, $4.25 net ; postpaid, $4-45. 



pufa^^hea yp^g MACMILLAN COMPANY ''l^ew 41°"' 



