LETTER OF SUBMITTAL. 
U. S. DEPARTMENT OF AGRICULTURE, 
DIVISION OF CHEMISTRY, 
Washington, D. C., February 29, 1892. 
Str: I herewith submit to you the report which has been prepared 
by Mr. E. E. Ewell and myself upon investigations of tea, coffee, and 
cocoa preparations. That part of the report and bibliographic work 
upon cocoa preparations is entirely due to Mr: Ewell, who has also 
assisted in the general analytical work. [ also acknowledge the assist- 
ance of Messrs. McElroy, Trescot, Krug, and Sanborn. 
This report has been unavoidably and materially delayed in its prepa- 
ration, but this time has not been lost, since much of the foreign and 
other work on artificial coffees has been accomplished since it was 
begun. 
Respecttully, 
G. L. SPENCER, 
Assistant Chemist. 
Pe. BW: WILEY, 
Chief Chemist. 
VII 
