140 



FUMIGATION METHODS 



Estimating cubic contents. The following excellent 

 method for determining the cubic contents of a green- 

 house has been suggested by Dr. B. T. Galloway: In all 

 cases where fumigation with this gas is to be followed 

 it is necessary to first determine accurately the cubic 

 contents of each house. The determination of the 



FIG. 72 DIAGRAM ILLUSTRATING METHOD OF DETERMINING 

 CUBIC CONTENTS OF GREENHOUSE. (AFTER GALLOWAY) 



cubic contents of the house, while in itself a compara- 

 tively simple problem, has, in the eyes of many grow- 

 ers, difficulties which they are not willing to under- 

 take. The cubic contents can be determined by a 

 comparatively simple mathematical calculation, but 

 perhaps the easiest way is by the square method. 

 This involves nothing more difficult than the mere 

 counting of a number of squares. On examining 

 Fig. 72 the simplicity of the method will become 



