POSCIENCE 
NEw SERIES. 
Vou. VI. No. 143. 
FRIDAY, SEPTEMBER 24, 1897. 
SINGLE COPIES, 15 cTs. 
ANNUAL SUBSCRIPTION, $5.00. 
The Volcanoes of North America. 
By ISRAEL C. RUSSEL, 
Professor in the University of Michigan. 
Cloth, 8vo. Just Ready. Price, $4.00 net. 
A work, which taken together with Sir Archibald Geikie’s comprehensive volumes on the Ancient Volca- 
noes of Great Britain, places in the hands of scientists adequate reference works on all branches of this impor 
tant 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 
Harvard University, author of “Economic 
Geology of the United States,” etc. 
12mo, cloth. Price, $1.40 net. 
Intended for High School Use, giving in combina- 
tion 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 Palceontology, Princeton Uni- 
versity. 
12mo, cloth, pp. 570. Price, $1.90 net. 
An admirable general view of the subject, for those 
who wish to lay a reliable, fairly proportioned foun- 
dation 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 very good education. 
Rocks, Rock-Weathering, and Soils. 
By GEORGE P. MERRILL, 
Curator of the Department of Geology, United States National Museum, and Professor of Geology in the Corcoran 
Scientific School and Graduate School of the Columbian University. 
Fully Illustrated. 
8vo, $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 struc- 
ture of the rocks composing 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. 
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 Rural Science Series. 
Books which state the underlying principles of agriculture in such language that they may be read at the 
home firseside, in the office, at the club or grange, or used as text-books. ach is substantially bound in blue 
cloth. 
The Soil: 
Its Nature. Relations, and Fundamental Prin= 
ciples of Management. 
By F. H. KING, 
Professor of Agricultural Physics in the University of 
Wisconsin. 
303 pages, 45 Illustrations. Price, 75 cents. 
“T consider it a most desirable addition to our 
agricultural literature, and a distinct advance over 
previous treatises on the same subject, not only for 
popular use, but also for students and specialists, who 
will find many new and useful suggestions therein.” 
E. W. HILGARD, 
Director of Agricultural Experiment Station, 
Berkeley, Cal. 
The Fertility of the Land: 
A Summary Sketch of the Relationship of 
Farm-Practice to the Maintaining and In= 
creasing of the Productivity of the Soil. 
By I. P. ROBERTS, 
Director of the College of Agriculture, Cornell University. 
Fully Illustrated. Cloth. Price, $1.25. 
This is a companion to Professor King’s book, treat- 
ing the subject from the standpoint of the actual far- 
mer, rather than that of the laboratory. Itis the only 
book which treats the philosophy of farm-practice in 
a modern way. The book is the result of a long life 
of teaching, experimenting and farming, and is the 
most important single book of farming methods which 
the farmer can secure. 
THE MACMILLAN COMPANY, 66 Fifth Avenue, New York City. 
