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LETTER OF TRANSMITTAL. 
Illinois Industrial University, 
Office of State Entomologist. 
Champaign, III., December 81, 1884. 
1 Excellency, John M. Hamilton, Governor of the State of Illinois: 
I have the honor to transmit herewith my third report as 
Entomologist of Illinois, covering the operations of the office 
|a year 1884. 
des the articles presented in the report proper, I have pre- 
an elaborate paper on certain contagions diseases of insects, 
i numerous studies and experiments made at the office for the 
/tion of the virus of such diseases and their propagation by 
;| al measures. This study has not yet reached the stage of 
successful application in the field on a large scale, and I 
herefore decided to withhold the results, for the present, from 
ition here, and to publish them instead as a contribution to 
3 in the Bulletins of the State Laboratory of Natural History. 
iace thus saved I have decided to use for an index to the 
velve reports of the State Entomologists of Illinois; and this 
: lented herewith as an appendix to my present report. 
Respectfully submitted, 
S. A. Forbes, State Entomologist. 
