\J U\J' /^ 



SCIENCE 



New Semes „ ^ ..o -inon Anntjal SrBSCEiPTiON, $6.00 



Vol. lvi, No. 1450 Friday, October 13, 1922 Single Copies, 15 Os. 



BLAKISTON BOOKS 



FOR EARLY PUBLICATION 



Palladin-Livingston— PLANT PHYSIOLOGY 



A second printing with numerous corrections, additions and improvements. 

 One new feature is a summary for each chapter in which a succinct but 

 complete statement of the main features dealt with in each is given. The 

 text is concise, readable and exceptionally thorough in treatment and with 

 well chosen citations from the literature of plant physiology. The chemical 

 aspects have been given greatest emphasis. 



2nd printing. 173 illustrations. By Vladimir I. Palladin (University of 

 Petrograd). Authorized English Edition, Edited by Burton E. Liv- 

 ingston, Ph.D., Professor of Plant Physiology and Director of Labora- 

 tory of Plant Physiology, Johns Hopkins University. 



Folsom ENTOMOLOGY 3rd Revised Edition 



With Special Reference to Its Ecological Aspects 



This edition has been brought up to date by the inclusion of a great deal 

 of new material and some new illustrations ; a new chapter on insect ecology 

 has also been added. 



3rd Edition. Illustrated by plates and text illustrations. By Justus 

 Watson Folsom, Sc.D., (Harvard) Assistant Professor of Entomology, 

 University of Illinois. 



Galloway ZOOLOGY dth Edition Revised 



A Textbook for Universities, Colleges, eind Normal Schools 



This new edition contains such progress in the science as bears most directly 

 upon the instruction of beginners. Greater accui'acy of details has also 

 been accomplished. 



4th Edition. With 255 Illustrations. By Thomas Walton Galloway, 

 Ph.D., Litt. D. Formerly Professor of Zoology, Beloit College, (Wise). 

 With assistance of Paul S. Welch, Ph.D., Associate Professor of Biology, 

 University of Michigan. 



P. BLAKISTON'S SON & CO. 



Publishers Philadelphia 





