THE MICROSCOPE IN MODERN PHARMACY 9 



substances. The illustrations are excellent and the subjects are comprehensively 

 treated. 



Vogl, "Pharmakognosie," 1892. 



This work describes the histology of the vegetable drugs used in Austria. The 

 histological descriptions are very accurate and complete. Only a comparatively 

 small number of the drugs are illustrated. 



Of the American text books on vegetable pharmacognosy only a 

 few deserve mention. Of the earlier American writers of texts on 

 pharmacognosy that of Maisch contains illustrations of the histology 

 of many of the vegetable drugs, but they are mostly diagrams of low 

 magnification (2 to 15 diameters) and, hence, of little value in the study 

 of tissue elements. This author also introduced micro-photographic 

 reproductions of sections of vegetable- drugs, but these proved a 

 total failure. 



Several recent American text-books touch on the microscopical 

 characteristics of vegetable drugs, notably that by Sayre, and also 

 the one by Wall. Prof. W. Mansfield of New York has done good 

 work in the microscopical study of vegetable drugs. Dr. Kraemer of 

 the University of Michigan has perhaps done more along this line than 

 any other investigator. It was largely through his untiring efforts 

 that the microscopical descriptions of vegetable drugs were introduced 

 into the U. S., P. IX. 



