SCIENCE— ADVERTISEMENTS 



"^be Ikober" 



AMERICAN MADE 



Nephelometer 



A precision colorimeter of highest 

 accuracy, the standard instrument 

 of more than forty Universities. 



Permanently set up on a black 

 polished board and housed in with 

 our lighting arrangement it serves 

 as the most efficient nephelometer 

 as well as a colorimeter. 



Colorimeter as pictured, $69.00. 



Combined nephelometer-colori- 

 meter complete on board with lamp- 

 house, $120.00. 



Colorimeter 



It has: 



Adjustable Verniers, Fused Caps 

 and Plungers, resisting all acids and 

 alkalies, thus eliminating all cement 

 troubles. 



Screw Threaded Rods over which 

 the stages travel, reducing to a 

 minimum lost motion so adherent 

 to racks and pinions. 



Perfect " Side by Side " field with 

 the thinnest dividing line. 



" Split Reflectors " making the 

 operator independent of poor light- 

 ing conditions. 



C. M. SORENSEN CO., Inc., Dept. K. 



177 East 87th Street NEW YORK, N. Y. 



Just Published 



A NEW EDITION OF 



SCIENTIFIC AND APPLIED 



PHARMACOGNOSY 



By HENRY KRAEMER, Ph.B. (in Chemistry), Ph.M. (in Pharmacy), Ph.D. (in Botany), Dean of College 

 of Pharmacy and Professor of Pharmacognosy in the University of Michigan College of Pharmacy 



Second Edition, Thoroughly Revised 



This book is designed for the use of students in pharmacy, as a handbook for pharmacists, and 

 as a reference book for food and drug analysts and pharmacologists. 



The book is the most complete dealing with Pharmacognosy that has ever been published and 

 contains the necessary information on nearly all of the drugs, foods, spices and economic products 

 which are generally used. While originally prepared for the use of the drug analyst, it is extensively 

 employed by pharmacologists, agricultural chemists, food analysts, spice dealers, manufacturers of 

 flavoring extracts, mineralogists and botanists. 



74.1 pages, 6xQ, 313 plates, comprising over 1000 £gures 

 Cloth, $6.00 net. 



JOHN WILEY & SONS, Inc. 



432 FOURTH AVENUE, NEW YORK 



London: Chapman & Hall, Ltd. 

 Manila, P. I. : Phillippine Education Company Montreal, Canada, Renouf Publishing Company 





