EXHIBIT OF THE BUREAU OF CHEMISTRY AT THE PAN-AMER- 

 ICAN EXPOSITION, BUFFALO, NEW YORK, 1901. 



INTRODUCTION. 



The exhibit of the Bureau of Chemistry will be found in the central 

 part of the north wing of the Government building. It has been so 

 planned as to illustrate three of the important features of the work of 

 the Bureau, namely, the study of pure and adulterated foods, the 

 beet-sugar industry, and the testing of road-making materials. It 

 was impracticable to include in the exhibit a number of lines of 

 investigation which are now in process or which have been completed 

 during recent years. The results of many of these have been pub- 

 lished, and are shown in a collection of publications which forms a 

 prominent feature of the exhibit. These will be found on the table 

 marked " 1." (See PI. I, frontispiece.) Since 1883, 62 bulletins and 7 

 small pamphlets, designated as circulars, have been issued, contain- 

 ing in all 7,989 pages. Numerous contributions have been made by 

 members of the Bureau to the Yearbook of the Department of Agri- 

 culture. The reports of sugar-beet investigations since 1897 have 

 been published as a part of the special report to Congress on this 

 subject. The results of the food investigations hitherto published are 

 contained in the nine parts of Bulletin 13 (1,374 pages). In addition 

 to the work reported in the regular publications of the Bureau, a con- 

 siderable amount of research work has been done which has been 

 reported from time to time in various scientific periodicals. 



Much of the time of the working force of the Bureau is required 

 for cooperative work carried on with or at the request of other 

 branches of the Department of Agriculture and the other Executive 

 Departments of the Government. 



EXHIBIT OF PURE AND ADULTERATED FOODS, 



By W. D. BIGELOW. 



In this exhibit it is desired to illustrate principles and not to call 

 attention to individual frauds. Interest would have been added had 

 it seemed best to display all the samples under their original labels. 

 It is apparent, however, that such a policy would have been unjust 

 to all manufacturers of pure foods whose goods were not exhibited, 



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