PREFATORY NOTE. 



WASHINGTON, D. 0., August 17, 1889. 



SIR : I submit herewith for your examination and approval Part Five 

 of Bulletin No. 13 on the adulteration of food. The present part con- 

 sists of an investigation of baking powders and a resume of our present 

 knowledge of the subject. 



In these investigations we have used every endeavor to avoid error 

 and bias. No particular powder has been favored at the expense of any 

 other one. Our samples have been purchased in the open market and 

 we have had them to represent as fairly as possible the character of the 

 goods sold. 



In such an investigation it is not possible to get results which will 

 please every dealer and manufacturer, and we may therefore expect 

 that many of our data will be distorted or denied by interested parties. 

 A more serious embarrassment may also confront us, and that is the 

 use of isolated portions of this report for advertising purposes. 



The public official who lends the name and authority of his office for 

 advertising purposes has little regard for either, and less for the pro- 

 prieties of his position. He has, however, no longer control of the data 

 of his analyses when they have once been published by the proper au- 

 thority. 



It would be well, in view of such facts, if the use of such matter for 

 advertising purposes could be absolutely forbidden. In the present 

 case I would like to emphasize the statement that any data or state- 

 ments in the present Bulletin which may be paraded by advertisers in 

 praise of their wares would show a discrimination wholly unauthorized 

 by the spirit and scope of this work. 

 Eespectfully, 



H. W. WILEY, 



Chemist. 



Hon. J. M. BUSK, 



Secretary of Agriculture. 



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