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SCIENCE 



New Series. 

 Vol. v. No. 122. 



Friday, April 30, 1897. 



Single Copies, 15 cts. 

 Annual Sobscription, J5.00. 



The Macmillan Company's New Booh. 



SIR ARCHIBALD GEIKIE'S NEW WORK. 



The Ancient Volcanoes of Great Britain. 



By Sir Archibald Qeikie, F. R. 5., 



D. C.L. (Oxford), D. 8c. {Camhridge and Dublin), LL.D. {St. Andrews and Edinburgh) . 



Director-General of the Geological Survey of Great Britain and Ireland. 



Memler of all the Academies of Science and Scientific Societies of note. 



With Seven Maps and Numerous Illustrations. 



Cloth. 8vo. Two Volumes. Price, $1 1.25 net. 



The present work is intended to offer a summary of what has now been ascertained regarding the former volcanoes of 



Great Britain, combined into a general narrative of the whole progress of volcanic action from the remotest geological 



periods down to the time when the latest eruption ceased. 



Rocks, Rock=Weathering, and Soils. 



By GEORGE P. MERRILL, 



Curator of Geology, U. 8. National Museum, Professor of Geology, Corcoran Scientific School, and Graduate 

 School of the Columbian University. 



Fully Illustrated. 8vo. Cloth. $4.00 net. 



Dr. Merrill has taken up a hitherto much neglected line of work, and one which on both economic and scientific 

 grounds is of the greatest interest and importance. He treats of the origin, composition, and structure of the rocks com- 

 posing the earth's crust, the manner of their weathering, or breaking down, and the causes that lead thereto, and finally of 

 the petrographic nature of the product of this breaking down. Much of the matter given is the result of the author's own 

 observations and research, and has never before appeared in print. 



The matter is so arranged that the book will be of value as a work of reference, and also as a text-book for students in 

 the Agricultural Colleges and Experimental Stations, while teachers and students in general geology or physiography 

 will find it to contain much of interest. 



The Volcanoes of North America. 



By ISRAEL C. RUSSELL, 



Professor in the University of Michigan, Ann Arbor. 



Cloth. 12mo. Nearly Ready. 



A work, which taken together with Sir Archibald Geikie's comprehensive volumes on the Ancient Volcanoes of Great 

 Britain, places m the hands of scientists adequate reference works on all branches of this important subject. 



Elementary Geology. 



By RALPH S. TARR, F. G. S. A., 



Professor of Dynamic Geology and Physical Geography 

 at Cornell University, formerly an Instructor in Har- 

 vard University, author of " Economic Geology of the 

 United States,' ' etc. 



12mo. Cloth. Price, $1.40 ueL 



Intended for High School use, giving in combination with 

 the " Elementary Physical Geography." by the same author, 

 an excellent foundation for the study of the natural sciences. 



An Introduction to Geology. 



By WM. B. SCOTT, 



Professor of Geology and Palaeontology, Princeton Uni- 

 versity, 



12mo. Cloth. Pp.570. Price, $1.90 nef. 



An admirable general view of the subject, for those who 

 wish to lay a reliable, fairly proportioned foundation for 

 later specialization, and for those who do not expect to do 

 further work along these lines, yet wish that knowledge of 

 the fundamental principles of the science essential to every 

 good education. 



THE MACMILLAN COMPANY, 66 Fifth Ayenue, New York City. 



