GREENHOUSE AND COLD FRAME FUMIGATION 141 



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 i square foot. 

 This particular house, it will be seen, is 18 feet (18 

 squares) wide, 12 feet to the ridge, 6^/2, 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 



