318 THE MONTHLY BULLETIN. 



CALIFORNIA SPRAY CHEMICAL COMPANIES. 



Balfour Guthrie Company, San Francisco, California. 



Bean Spray Pump Company, San Jose, California. 



Braun Corporation, Los Angeles. California. 



Braun-Kneeht-Heimann, San Francisco, California. 



California Drug and Chemical Company, Los Angeles, California. 



California Rex Spray Company, Beni( ia, California. 



California Spray-Chemical Ccmpany. Watsonville. California. 



Fruit Growers' Supply Company, Los Angeles, California. 



Haas, Baruch & Company, Los Angeles, California. 



Kirk-Geary, Sacramento, California. 



Mountain Copper Compauy, San Francisco. California. 



Monarch Oil Refining Company, San Francisco, California. 



The American Agricultural Chemical Company, Los Angeles, Cal. 



CALIFORNIA SPRAYING MACHINE COMPANIES. 



Baker & Hamilton, San Francisco, California. 

 Bean Spray Pump Company. San Jose, California. 

 Crane Company. San Francisco, California. 

 Household Supply Company. San Francisco, California. 

 Smith-Booth-Usher. Lcs Angeles, California. 

 Theo. Poindexter, San Francisco, California. 



^FUMIGATION. 



Fumigation consists in the generation and uses of gases to kill destruc- 

 tive insect pests. Formerly such practices were limited to the uses of 

 carbon bisulfid, sulphur dioxid and tobacco fumes. The use of hydro- 

 cyanic acid gas in citrus orchards has lately l)een so perfected as to 

 become of very great importance and has opened up a remarkable field 

 in the control of orchard pests. 



CARBON BISULFID. 



Carbon bisulfid is a lic[uid which evaporates into a heavy, highly 

 explosive gas. It was first used for fumigating beans, grains or cereals 

 for weevils, and is still a very efficient method of controlling such pests. 

 Tu handling the liquid great care should be taken to keep it away from a 

 flame on account of its being highly explosive. 



*For further information relative to fumigation, see 



Bull. No. 76, Bur. Ent, U. S. Dept. Agrcl., by A. W. Morrill. 



Bull. No. 79, Bur. Ent, U. S. Dept. Agrcl., by R. S. Woglum. 



Bull. No. SO, (Part I.) Bur. Ent.. U. S. Dept. Agrcl., by R. S. W^oglum. 



Bull. No. 90, (Part II.) Bur. Ent., U. S. Dept. Agrcl., by R. S. Woglum. 



Bull. 152, Cal. Agrcl. Exp. Sta., by C. W. Woodworth. 



Circular No. 11, Cal. Agrcl. E.xp. Sta., by C. W. Woodworth. 



Circular No. 50, Cal. Agrcl. Exp. Sta., by C. W. Woodworth. 



