GREENHOUSE AND COLD FRAME FUMIGATION I41l 
apparent. Procure from a stationery store or art sup- 
ply store some cross-section paper, such as represented 
in the figure. In this particular case squares of three 
sizes are shown, the largest being one-half inch, the 
next one-fourth inch, and the smallest one-sixteenth 
inch square. ‘The one-fourth inch squares may repre- 
sent feet. Now determine the dimensions of the 
house, that is, the length, width, hight to ridge, and 
hight on sides, and make a sketch as shown, each 
square or one-fourth inch representing 1 square foot. 
This particular house, it will be seen, is 18 feet (18 
squares) wide, 12 feet to the ridge, 6% feet high at 
the back, and 4% feet high in front. 
The ridge stands 5 feet from the back wall, as 
shown in the sketch. After the lines are drawn, sim- 
ply count the squares inclosed, and the number of 
squares will be the number of square feet. The parts 
of squares, that is, where a line divides a square, can 
be easily determined by counting the smallest squares, 
or by the eye, and by adding these fractions of squares 
together the number of whole squares may be readily 
found. After the number of square feet is obtained it 
is only necessary to multiply this by the length of the 
house in feet and the result will be the cubic contents. 
For example, supposing the house in question is 100 
feet long, it contains 150% squares or square feet, and 
150% multiplied by 100 equals 15,050 cubic feet. The 
whole operation requires less time than it takes to 
describe it, and will apply, of course, to a house of any 
shape or size. It may be added that if the cross- 
section paper can not be obtained readily the sections 
or squares can be laid off with a rule and lead pencil 
