LETTER OF TRANSMITTAL 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C., November 18, 1909. 



SIR : I have the honor to submit for your approval a revision of the 

 bulletin issued in April, 1908, giving methods of analysis for miscel- 

 laneous supplies such as are examined in the Contracts Laboratory of 

 this Bureau. The work of testing supplies delivered to the Govern- 

 ment on contract grows continually both in extent and in importance, 

 and the wide variation in the nature of the articles received renders 

 the selection of methods for their analysis of peculiar difficulty. The 

 expansion of the work during the last year and the number of new 

 methods which have been tried and found satisfactory make a revi- 

 sion of the bulletin advisable, since the assembling of these methods, 

 tested by experience and modified accordingly, is of service both to 

 those engaged in similar work and to the manufacturers who wish to 

 comply with the specifications. I recommend, therefore, that this 

 manuscript be published as Bulletin 109, Revised, of the Bureau of 

 Chemistry. 



Respectfully, H. W. WILEY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



