The rectangle A D G F is computed in the same way, except that 
in this case it is not necessary to reduce the feet to inches. It would 
be 12 feet multiplied by 2 feet by 100 feet equals 2,400 cubic feet. 
This brings us to the triangles. The rule generally given for calcu- 
lating the area of a right-angle triangle is to multiply the base by 
the perpendicular and divide the product by 2. The result multi- 
plied by the length of the house will give the number of cubic feet 
the triangular portion contains. For example, taking the triangle 
ACE: 6 feet multiplied by 3 feet 6 inches, equals 21 feet, divided 
by 2 equals 10.5 feet, multiplied by 100 feet equals 1,050 cubic feet. 
The area of the triangle E C D and the cubic feet in this part of the 
house are determined in the same way; or, in this case, since the tri- 
angles are equal, the desired result is obtained by multiplying the 
number of cubic feet in the triangle A C E by 2; 1,050 multiphed 
by 2 equals 2,100 cubic feet. The contents of this house is therefore 
145.83 plus 2,400 plus 2,100, equals 4,645.83 cubic feet; this result 
multiplied by the required dose per cubic foot of space will give the 
amount of cyanide of potassium necessary for one fumigation. 


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Fig. 2.—End section of even span house at left, same of three-quarter span house at right 
(original). 
Fig. 2 shows at the right a cross section of a three-quarter span 
house 100 feet long, 18 feet wide, front wall 4 feet 4 inches, back 
wall 6 feet 4 inches, and 11 feet 10 inches to the ridge. The cubic 
contents of this 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 contents 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 rectangles and calculating 
as demonstrated above. 
AMOUNT OF POTASSIUM CYANIDE TO USE. 
After the number of cubic feet in the space to be fumigated is 
determined, the amount of cyanide required is found by multiplying 
the cubic contents by the dose per cubic foot. For example, if single 
