MACMILLAN &. CO.'S PAGE. 



The Ocean Survey Expedition. 



The Depths of the Sen. An Account of the 



General Results of the Dredging Cruises of II. 



M. S. Porcupine and Lightning, during the 



summers of 1868-'69-'70, under the scientific 



direction of Dr. Carpenter, P. R. 8. ; J. Gwyn 



Jeffries, P. R. 3.: and Dr. Wyville Thomson, 



P. R. 3. By Prof. "Wyville Thomson, P. R. 3., 



Head of the Scientific Staff of Civilians in the 



"Challenger' 1 Expedition. Medium 8vo. With 



nearly one hundred exquisite Illustrations and 



eight colored Maps and Plans. Price, $9.00. 



Contents. Chapter I. Introduction. Chapter 



II. The Cruise of the Lightning. Chapters III. and 



IV. The Cruise of the Porcupine. Chapter V. Decp- 



Sea Sounding. Chapter VI. Deep-Sea Dredging. 



Chapter VII. Deep-3ea Temperature. Chapter 



VIII. The Gulf Stream. Chapter IX. The Deep- 



Sea Fauna. Chapter X The Continuity of the 



Chalk. 



OPINIONS OF TEE PRESS. 



'"The Depths of the Sea 1 is a work that every 

 biologist should read, and for the general student of 

 science it is the only general treatise on this sub- 

 ject." American Naturalist. 



"The author has admirably performed his task 

 by the production of a work of no less popular in- 

 terest than scientific value. . . . The volume, which 

 forms one of the most important contributions of 

 the season to the science of physical geography, is 

 brought out in a style of rare typographical elegance, 

 and is copiously illustrated with admirable drawings 

 from Nature. It will fill a choice place in the li- 

 brary, both for the interest of its contents, and the 

 beauty of its execution. 11 N. Y. Tribune, April 1. 



" It is splendidly illustrated, and popularly written, 

 with much humor, and the treatment, like the sub- 

 ject, is any thing but dry ; it is a volume altogether 

 worthy the interest and importance of its subject. 11 

 Popular Science Monthly. 



" Our outline will lead persons interested in the 

 pushing back of the boundaries of ignorance to ex- 

 amine for themselves, and to be delighted with the 

 freshness of the subject, the elegance of the diction, 

 and the great beauty of the illustrations." N. Y. 

 World. 



"Nothing can be more complete than the account 

 of the scientific results of these voyages, which are 

 fully illustrated by woodcuts of the strange forms 

 of life brought from the dark depths of the ocean, 

 by charts of soundings, and elaborate tables of the 

 deep-sea temperatures. The book is another ad- 

 mirable example of that mingling of literary interest 

 with scientific completeness and value which is the 

 only true form of what is called the popularization 

 of science." Daily News (London). 



" Dr. Thomson and his at>le assistants have ren- 

 dered this heretofore unknown world a thing with 

 which we may now become almost familiar; and 

 we do not envy the mind which can remain indif- 

 ferent to the knowledge of the life beneath the wa- 

 ters, of which life most of us know nothing." 

 Journal of Applied Chemistry. 



Popular Book on Primeval Man. 



Hie Childhood of the World. A Simple Ac- 

 count of Man in Early Times. By Edward 

 Clodd, P. R. A. S. Extra foolscap. Svo. Cloth, 

 gilt, $1.00. 



" I have read your little book with great pleas- 

 ure. Nothing spoils our temper so much as having 

 to unlearn in youth, manhood, and even in old age, 

 so many things which we were taught as children. 

 A book like yours will prepare a far better soil in 

 the cbihTs mind, and I was delighted to have it to 

 read to my children." Letter from Prof. Max 

 M'uller to the Author. 



Me. J. Noeman Locktbe^ New Book. 



The Spectroscope and its Applications. 



By J. Norman Lockyer, P. R. S. With Colored 

 Plate and Illustrations. (Forming the First 

 Volume of the "Nature Series.") Crown 8vo. 

 $1.50. 



Life and Letters of James David Forbes, 

 F. R S., D. 0. L, LL D. 



By John C. Shairp, LL. D., Peter G. Tait, M. A., 

 and A. Adams-Reilly, F. R. G. S. With Por- 

 traits, Map, and Illustrations. 8vo. $6.50. 

 "Not only a biography all should read, but a sci- 

 entific treatise without which the shelves of no phys- 

 icist's library can be deemed complete." London 

 Standard. 



Body and Mind. 



An Inquiry into their Connection and Mutual Influ- 

 ence, specially in reference to Mental Disorders. 

 An enlarged and revised edition, to which are 

 added Psychological Essays. By Henry Mauds- 

 ley, M. D. 12mo. $2.00. 



All interested in the Progress of Science should read 



NATURE, 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



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One of the leading objects of this periodical is to 

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