LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Chemistry, 

 Washington, D. C, May 18, 1908. 

 Sir: I submit herewith for your consideration and approval the 

 manuscript of a preliminary report on the changes in food products 

 kept in storage, especially at low temperatures. These investigations 

 have been carried on in harmony with the will of Congress as spe- 

 cifically expressed in the several appropriation bills of the last few 

 years. The objects of the studies are fully stated in the introduction 

 to the present report, now offered for publication as Bulletin 115 of the 

 Bureau of Chemistry. 



Respectfully, H. W. Wiley, 



Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



