DIV. INSECTS 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 90. 



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



HYDROCYANIC-ACID GAS FUMIGATION 

 IN CALIFORNIA. 



CONTENTS AND INDEX. 



Issued October 25, 1912. 



/ 



Z&Alf* 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1912, 



