182 



FOOD AND DRUGS 



[C//. VI 



\ 256. Food and Drugs. From the nature of food and pharmacological 

 products adulterations are in many cases most accurately and easily determined 

 by microscopic examination. The student will find constant reference to the 

 microscopical characters of the genuine and spurious substances in medicines 

 and other pharmacological products in works on pharmacy or pharmacology; 

 also in pharmacological journals and in druggists reports. 



For works and articles upon textile fibers see: Herzfeld, J. Translated by 

 Salter. The technical testing of yarns and textile fabrics with reference to 

 official specifications. London, 1898. E. A. Posselt The structure of fibers 



FIG. 142. Ncbelthau's Traversing Microscope. This instrument makes 

 it possible to go over carefully very large objects, entire brain sections, or to 

 scrutinize carefully a large amount of a substance as in examinations for 

 adulterations of foods or drugs. (From Leitz' Catalog. ) 



