SCIENCE-ADVERTISEMENTS 



IMPORTANT BOOKS IN SCIENCE 



THE MECHANISTIC CONCEPTION OF LIFE. Biological Essays by Jacques Loeb, Member of the Rockefeller 



Institute for Medical Research. 238 pages, 12mo, cloth; postpaid, 31.65. 



In this book Professor Loeb presents many of the current problems in biology, and discusses the question whether 



the phenomena of Ufe can be explained by physical and chemical laws. He finds it possible to control by physical and 



chemical means not merely the processes of reproduction, but also the conduct of animals with reference to environ- 



JOHNS HOPKINS HOSPITAL BULLETIN. All eager to know more of the origin of life will find no modern book of 



its size nearly so instructive or inspiring. 

 HEREDITY AND EUGENICS. By John M. Coulter, William E. Castle, Edwaed M. East, William L. Towee, 

 and Chaeles B. Davenpoet. 312 pages, 8vo, cloth : postpaid, $2.70. 

 Leading investigators have in this work made clear the present position of evolution, experimental results in 

 heredity in connection with both plants and animals, the enormous value of the practical application of these laws,in 

 breeding, and human eugenics. The volume is profusely illustrated. 



BRITISH MEDI AL JOURNAL. Those who are desirous of arriving at an estimate of the present state of knowl- 

 edge in all that concerns the science of genetics, the nature of the experimental work now being done in its 

 various departments, . . . and the prospects, immediate or remote, of important practical application, 

 cannot do better than study Heredity and Eugenics. 

 AMERICAN PERMIAN VERTEBRATES. By Samuel Wendell Williston, Prof essor of Paleontology in the Uni- 

 versity of Chicago. 152 pages, 39 plates, 8vo, cloth ; postpaid, $2.68. 

 This work comprises a series of monographic studies, with briefer notes and descriptions, of new or little-known am- 

 phibians and reptiles from the Permian deposits of Texas and New Mexico. The work is illustrated by the author. 

 ATHENAEUM The paleontologist will welcome the work as a soUd contribution to our knowledge of a fauna which is of 

 exceptional interest to the student of evolution, inasmuch as it includes forms that help to bridge over some of 

 the differences between reptile and amphibians. 

 MORPHOLOGY OF GYMHOSPERMS. By John M. Coultek, Professor of Botany, and Chables J. Chambeklain, 

 Associate Professor of Botany, University of Chicago. 470 pages, 462 illustrations, 8vo, cloth ; postpaid, $4.22. 

 Each of the seven great groups of gymnosperms is here presented in detail, and a final chapter discusses the prob- 

 lem of phylogeny and points out the evolutionary tendencies. The extinct groups are now included for the first time 

 and vascular anatomy is recognized as a morphological subject of first importance. The illustrations are numerous 

 and in large part original. , , , 



NATURE. The book is an invaluable record, admirably illustrated, of our present knowledge of the older type of 

 ^:-- ^. seed-plants, jjs^i^br.. 



CHICAGO, 

 ILLINOIS 



THE UNIVERSin OF CHICAGO PRESS 



AGENTS: The Baker & Taylor Company, New York. 



The Cambridge University Press, London and Edinburgh. 

 Karl W. Hiersemann, Leipzig. 



The Mamzen-KabuBhild-Eai&ha, Tokyo, Osaka, and Kyoto. 



Recent Publications of the New Yorlc Botanical Garden 



Journal, Vol. XIV, No. 168. An Illustrated monthly containing notes and non-teohnical articles of 

 general interest. SI. 00 a year. 



Mycologia, Vol. VI, No. 1. An illustrated bimonthly publication devoted to fnngi and lichens. 

 $3.00 a year. This number contains: Illustrations of Fungi — XVII, by William A. Murrill; 

 A Preliminary Study of the Genus Lamprospora, by Fred J. Seaver; Notes on Uredinopsis 

 mirabilis and Other Eusts, by W. P. Fraser ; Observations on the Use of Ridgway's New 

 Color-Book. The Color of the Spores of Volvaria speciosa Fr., by L. C. C. Krieger; New or 

 Interesting Fungi, by David Ross Sumstine ; Aerial Galls of the Mesquite, by F. D. Heald ; 

 News and Notes; Index to American Mycological Literature. 



Bulletin, Vol. VIII, No. 29. $3.00 per volume. This number contains the annual report of the 

 Director-in-Chief and other official documents. 



Memoirs, Vol. 3. $2.00. Studies of Cretaceous Coniferous Remains from Kreischerville, New York, 

 by Arthur Hollick and Edward C. Jeffrey, vii+138 pp., with 29 plates. 

 • Vol. 4. $2.00. Effects of the Rays of Radium on Plants, by C. Stuart Gager, vii-f 278 pp., 

 with 73 figures and 14 plates. 



Nortli American Flora. Descriptions of the vriild plants of North America. To be complete in 

 about thirty volumes of four or more parts each. Subscription price for entire work $1.50 

 per part; separate parts $2.00. Twenty parts have been issued, seven on fungi, ten on 

 flowering plants, one on ferns, and two on mosses. Parts recently issued are: 



Vol. 15, part 1, issued June 14, 1913. Sphagnaceae, Andreaeaceae, Archidiaceae, 



Brnchiaeeae, Ditrichaceae, Bryoxiphiaceae, and Seligeriaceae. 

 Vol. 15, part 2, issued August 8, 1913 Dicranaceae and Leucobryaceae. 

 Vol. 22, part 5, issued December 23, 1913. Rosaceae (pars). 



Contributions. A series of technical papers by students or members of the staff. $5.00 per vol- 

 ume ; 25 cents each. Recent numbers : 159. A Case of Bud-Variation in Pelargonium, 

 by A. B. Stout. 160. Studies on the Rooky Mountain Flora— XXIX, by Per Axel 

 Rydberg. 161. West Indian Mosses— I, by Elizabeth G. Britton. 162. Phytogeograph- 

 ical notes on the Rooky Mountain Region I, Alpine Region, by P. A. Rydberg. 



BRONX PARK, NEW YORK CITY 



