United States Department of Agriculture, 



BUREAU OF CHEMISTRY Circular No. 28. 



H. W. WILEY, Chief of Bureau. 



PROVISIONAL METHODS FOR TH? DETERMINATION OF FOOD PRE- 

 SERVATIVES AS AUTHORIZED BY THE ASSOCIATION OF OFFICIAL 

 AGRICULTURAL CHEMISTS, 1905. 



INTRODUCTION. 



The following revision of the provisional methods for the determi- 

 nation of preservatives has 'been made in accordance with the action 

 taken by the association at the convention of 1905, when the follow- 

 ing motion was passed: 



Resolved, That the rearrangement of the provisional methods for the detection of preserva- 

 tives suggested by the referee be adopted. 



In order to carry out these instructions it was necessary to rewrite 

 some sections, and the revision also includes all changes and additions 

 to these methods made since Bulletin No. 65, Provisional Methods 

 for the Analysis of Foods, was approved at the meeting of the associa- 

 tion in 1901. 



W. D. BlGELOW, 



Chief, Division of Foods, and 

 Referee on Food Adulteration, A. 0. A. C., 1901-1905. 



Approved. 



JAMES WILSON, 



Secretary of Agriculture. >Ti i'RjfJ 



WASHINGTON, D. C., April 9, 1906. 



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