1 4 2 



FUMIGATION METHODS 



and practically the same results obtained. In any 

 event, it is only necessary to get an accurate outline 

 drawing of the section of the house, and by projecting 

 this over squares as indicated the number of square feet 

 in the section can be readily determined. 



The cubic contents of the two styles of greenhouses 

 shown in Fig. 73 are easily estimated, according to the 

 following scheme by Professors Woods and Dorsett. 

 At the left is an even span house 100 feet long, 12 feet 

 wide, 2 feet on the sides, and 5 feet 6 inches from the 



FIG. 73 EVEN AND THREE-QUARTER SPACE HOUSES AT LEFT 

 AND RIGHT END SECTIONS. (AFTER WOODS AND DORSETT) 



the surface of the beds to the ridge, with a walk 14 

 inches wide and 15 inches deep. To determine accu- 

 rately the number of cubic feet in a house make a 

 rough drawing showing a cross-section, and divide the 

 space into triangles and rectangles by drawing a line 

 connecting the two wall plates and one from the ridge 

 at right angles to this ; mark on each its respective 

 length in feet and inches. Compute the number of 

 cubic feet in each of the rectangles and triangles. In 

 the even span house, shown at the left, the number of 

 cubic feet of space in the walk is found by multiplying 

 the width by the depth by the length, thus: Multiply 



