SECTS. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 90, Part III. 



L. O. HOWARD, Entomologist and Chief of Bureau. 



HYDROCYANIC-ACID GAS FUMIGATION IN 



CALIFORNIA. 



CHEMISTRY OF FUMIGATION WITH 

 HYDROCYANIC-ACID GAS. 



BY 



c. c. McDonnell, 



Chief, Insecticide and Fungicide Laboratory, Miscellaneous Division, 

 Bureau of Chemistry. 



Issued May 10, 1911. 



/ 



3 3 4*7^ 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1911. 



