144 FUMIGATION METHODS 
house is determined in the same manner, except that 
the two triangles being unequal, each one will have to 
be calculated separately. The house contains 15,050 
cubic feet. It will thus be seen that the cubic con- 
tents of a house or frame of any style can be readily 
determined by simply dividing a cross-section of the 
same into the necessary number of triangles and rect- 
angles, and calculating as demonstrated above. 
Cold frames.—That cold frames can be successfully 
fumigated has been shown by recent practical work. 
Make the frames as nearly air-tight as possible, and 
cover them with blankets or canvas if necessary. 
Estimate the cubic contents of air space inclosed, and 
then calculate the amount of cyanide necessary. For 
example, suppose a frame contained 567 cubic feet. 
Multiply this by 0.15, an equivalent of 0.15 gramme 
cyanide per cubic foot. ‘Therefore, 567 x 0.15, equals 
85.05 grammes; reduced to ounces by dividing by 
28.35, as there are 28.35 grammes in an ounce, gives 
(85.05 divided by 28.35) 3 ounces the amount of cya- 
nide required. 
This inclosure would require 3 ounces cyanide, 4% 
ounces sulphuric acid and 634 ounces of water. After 
the cyanide is determined it is easy to estimate the 
acid and water. Usea half more acid, liquid measure, 
than cyanide, and a half more water than acid. Weigh 
the cyanide and wrap it in paper or a bag. Measure 
the acid in a glass beaker, marked ounces on the side, 
and pour it in an earthern jar or china bowl ; measure 
the water and pour upon the acid. When everything 
is in readiness drop the cyanide, paper and all, into 
the liquids and close the frames quickly. 
