74 CALIFORNIA CITRUS CULTURE. 
Acid Container. For ordinary work a three, five or ten-gallon 
earthenware jar is sufficient. A lead lid for the top and a three fourths 
inch iron pipe inserted through a hole in the side near the bottom with 
a piece of pure rubber tubing six inches long and closed by a clamp 
is a cheap and practical device. Lead-lined tanks are more durable, 
but also much more expensive. 
Water Tank. As there is three times as much water used as acid 
the water tank must necessarily be larger. For a hand cart a pickle 
keg is excellent, while a twenty-five or fifty-gallon barrel may be neces- 
sary for a large wagon. An extension pipe and faucet furnish the 
outlet which should be near that of the acid tank. 
Graduates. The quantity of acid and water used depends entirely 
upon the amount of cyanide required for a dose. For every ounce of 
potassium eyanide one fluid ounce of sulphuric acid and three fluid 
Tic. 50.—A cheap and satisfactory hand chemical cart. (Photo by Vaile.) 
ounces of water are used, while for sodium cyanide one and a half 
fluid ounces of sulphuric acid and two fluid ounces of water are used. 
As this is a fixed ratio in each case, graduates have been made to 
measure out the exact amount of the liquid required in the terms of the 
number of ounces of cyanide; for instance, if it required twelve ounces 
of sodium cyanide for a dose the acid graduate is so sealed that it would 
be filled to the twelve ounce line, which would mean eighteen liquid 
ounces and the water graduate to the twelve ounce line, which would 
be twenty-four liquid ounces. Such a scheme makes it unnecessary to 
make mental calculations and thus avoids mistakes. . 
