FUMIGATION WITH CYANIDE GAS. 205 



fourth inch squares may represent feet. Now 

 determine the dimensions of the house, that is, 

 the length, width, height to ridge, and height 

 on sides, and make a sketch as shown, each 

 square, or one-fourth inch, representing one square 

 foot. This particular house, it will be seen, is 

 eighteen feet (eighteen squares) wide, twelve 

 feet to the ridge, six and one-half feet high at 

 the back, and four and one-half feet high in 

 front. The ridge stands five feet from the 

 back wall, as shown in the sketch. After the 

 lines are drawn, simply count the squares in- 

 closed, 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 one 

 hundred feet long, it contains one hundred and 

 fifty and one-half squares, or square feet, and one 

 hundred and fifty and one-half multiplied by one 

 hundred 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 



