LETTER OF TRANSMITTAL. 
U. S. Department or AGRICULTURE, 
Bureau or Enromo.wocy, 
Washington, D. C., March 2, 1908. 
Sir: I have the honor to transmit herewith a second revision of 
Farmers’ Bulletin No. 127, on insecticides. The five years that have 
elapsed since the last revision of this publication have brought some 
important additions to our knowledge of insecticides and have neces- 
sitated some changes of old formulas. These additions and correc- 
tions have been incorporated in this revision. As stated in the letter 
of transmittal to the first edition, this bulletin supplants Farmers’ 
Bulletin No. 19, prepared in 1894 by Mr. C. L. Marlatt, then First 
Assistant Entomologist. The latter publication, having gone through 
four slightly revised editions, was in large part rewritten by Mr. 
Marlatt early in 1901 and issued under the new number to take the 
place of the older publication. 
Respectfully, 
L. O. Howarp, 
Entomologist and Chief of Bureau. 
Hon. James WILSON, 
Secretary of Agriculture. 
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