PHYSICAL SCIENCE. ij 



Stewart and Tait.— the unseen universe: or, 



Physical Speculations on a Future State. By Balfour Stewart, 

 F.R.S.,and P. G. Tait, M.A. Sixth Edition. Crown 8vo. 6j-. 

 " Ike book is one which -well deserves the attention of thottghtjid and 

 religious readers. . . . It is a perfectly sober imjuiry, on scientifc 

 grounds, into the possibilities of a future existence." — Guardian. 

 Tait.— LECTURES ON SOME RECENT ADVANCES IN 

 PHYSICAL SCIENCE. By P. G. Tait, M.A., Professor of 

 Philosophy in the University of Edinburgh. Second edition, 

 revised and enlarged, vi^ith the Lecture on Force delivered before 

 the British Association. Crown 8vo. <^s. 

 Taylor.— SOUND AND MUSIC : A Non-Mathematical Trea- 

 tise on the Physical Constitution of Musical Sounds and Harmony, 

 including the Chief Acoustical Discoveries of Professor Llelm- 

 holtz. By Sedley Taylor, M.A., late Fellow of Trinity Col- 

 ledge, Cambridge. Large crown 8vo. 8j. 6d. 

 "In no previous scientific treatise do we remember so exhaustive and 

 so richly illustrated a dcscriptimi of forms of vibration and of 

 ■wave-motion in fluids." — Musical Standard. 

 Thomson. — Works by SiR Wyville Thomson, K.C.B., F R S 

 THE DEPTHS OF THE SEA : An Account of the General 

 Results of the Dredging Cruises of H.M.SS. "Porcupine" and 

 "Lightning" during the Summers of 1868-69 and 70, under the 

 scientific direction of Dr. Carpenter, F.R.S., J. Gwyn Jeffreys, 

 F.R.S., and Sir Wyville Thoinson, F.R.S. With, nearly 100 

 Illustrations and 8 coloured Maps and Plans. Second Edition. 

 Royal 8vo. cloth, gilt. 3IJ. 6d. 



The Athenaeum says : " The book is full of interesting matter, and 

 is written by a master of the art oj popular exposition. It is 

 excellently illustrated, both coloured maps and woodcuts possessing 

 high merit. Those who have already become interested in dredging 

 operations will of course make a point of reading this work ; those 

 who wish to be pleasantly introduced to the subject, and rightly 

 to appreciate the news which an ives from time to time from the 

 ' Challengei;^ should not fail to seek instruction from it." 

 THE VOYAGE OF THE " CHALLENGER."— THE ATLAN- 

 TIC. A Preliminary account of the Exploring Voyages of H. M.S. 

 "Challenger," during the year 1873 and the early part of 1876. 

 With numerous Illustrations, Coloured Maps & Charts, & Portrait 

 of the Author, engrayed^byC. H. Jeens. 2 Vols. Medium 8vo. 42^-. 

 The Times says : — " // is right that the public should have some 

 authoritative account of the general reszdts of the expedition, and 

 that as many of the ascertained data as may be accepted with con- 

 fidence should speedily find their place in the general body of 

 scientific kno'wledge. No one can be more competent than the 

 acconiplished scientific chief of the expedition to satisfy the public in 

 this respect. . . . The paper, printing, and especialy the numerous 

 illustrations, are of the highest quality. . . . IVe have rarely, if 

 ever, seen ?nore beautiful specimens of wood engraving than abound 



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