DTV. INSECTS, 



U. S. DEPARTMENT OF AGRICULTURE, 



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



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



HYDROCYANIC-ACID gas fumigation 



IN CALIFORNIA. 



THE VALUE OF SODIUM CYANID FOR 

 FUMIGATION PURPOSES. 



BY 



R. S. YTOGLUM, M. S. A., 



Special Field Agent. Bureau of Entomology. 



Issued May 10, 1911. 



/ 



&3 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1911. 



