LETTER OF SUBMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
DIVISION OF ENTOMOLOGY, 
Washington, D. C., March 20, 1888. 
Str: The sixth edition of Bulletin No. 9 of this Division, on the Silk- 
worm, having been exhausted, I have the honor to present for publica- 
tion a seventh edition, which is little more than a reprint of the sixth, 
with such slight changes as late experience has suggested. 
Respectfully, 
C. V. RILEY, 
Entomologist. 
Hon. NorMAN J. COLMAN, 
Commissioner of Agriculture. 
