10 



to call attention here to the fact that the public ideas of adulteration o1 

 food are in many cases very much exaggerated, and this, perhaps, is the 

 cause of the many extravagant assertions which are made. 



The arrangement of the material in this bulletin was a matter o] 

 careful consideration, and it was deemed best to make as few changes 

 in the original matter as were compatible with a proper classificatior 

 of the data at hand. The changes, furthermore, made by me in th 

 manuscript are only such as have helped to a better statement of the 

 facts or to correct errors overlooked by the compiler. 



H. W. WILEY, 

 Chief of the Division of Chemistry. 







