on 
CALIFORNIA CITRUS CULTURE. 
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ACID GENERATORS. 
Acid generators are earthenware pots usually made in gallon, two- 
gallon and three-gallon sizes and with or without lids (Fig. 52). The 
lid has long been recognized as a valuable adjunct to a generator by 
throwing the gas outward, thus preventing burnings directly above the 
generator. It also prevents the sputtering over of the acid due to the 
violent chemical reaction when the cyanide is added. So far there 
appears to be no lid manufactured which is entirely satisfactory, 
though nearly all fumigators prefer those on the market to the open 
generator. A suitable lid should be light and hinged so as to admit of 
easy emptying. 
Fic. 51.—A specially constructed chemical wagon. (Photo by Fawcett.) 
The two-gallon generator is more generally used because it more 
nearly meets the requirements of large and small doses. Care should 
be exercised not to fill a single pot more than one third full of acid and 
water before the cyanide is added as the contents may boil over and 
much of it be wasted. For large doses use two or more generators to a 
tree. To prevent unnecessary sputtering, especially when open genera- 
tors are used, small cheap paper bags are excellent to contain the cyanide 
when it is dropped into the acid. 
