14 



FUMIGATION OF APPLES FOR SAN JOSE SCALE. 



beneath the cyanid. The door was then put in place and fastened 

 with the clamps. At the proper time the cyanid was dropped into 

 the acid jar by pulling the string extending to the outside, and 

 fumigation continued for the desired time. At the close of the 

 period of fumigation, the lower valve was first opened, then the 

 upper valve, and the electric blower started, thus driving out the gas. 



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 3 



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3d 



3b 



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Fig. 2. — Fumigation Apparatus. A: 1, Door in place; la, door clasps; 2, slat support for fruit packages; 

 3, discharge box; 3a, perforated arms; 36, cyanid cup on wire pulley; 3c, sulphuric acid and water jar; 

 3d, door of discharge box; 4, air blast fan or blower; 4a, motor; 46, air suction pipe to outside of building; 

 4c-d, switch board and connections; 5, valve for inlet of air to box; 6, valve for discharge of gas from box; 

 6a, outlet pipe. B: Showing construction of discharge box; same lettering as in A. (Original.) 



Chemically pure potassium cyanid and sulphuric acid were used 

 in all the tests and also distilled water. The cyanid was weighed 

 on chemical balances and the liquids measured by means of a 

 burette graduated to 0.1 c. c. The chemicals were uniformly used 

 in the proportion of potassium cyanid, 1; sulphuric acid, 2; and 

 water, 4. 



