FUMIGATION WITH CYANIDE GAS. 203 



used with perfect safety for fumigating violets. 

 Moreover, the flowers a few hours after the gas 

 had been used were perfectly sweet and showed 

 no effects whatever from the action of the gas. 

 From time to time various changes were made as 

 to the methods of application, until finally the 

 practice has developed into a comparatively simple 

 operation, which may be described as follows: 



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 cubic contents of the 

 house while in itself a comparatively simple 

 problem, has, in the eyes of many growers, diffi- 

 culties which they are not willing to undertake. 

 The cubic contents can be determined by a com- 

 paratively simple mathematical calculation, but 

 perhaps the easiest way is by a method recently 

 described by the writer in the Florists' Exchange * 

 This method involves nothing more difficult than 

 the mere counting of a number of squares, and 

 from an examination of the accompanying illus- 

 tration the simplicity of the method will become 

 apparent. Procure from a stationery store or art 

 supply 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- 



*Florists' Exchange, Vol. II, No. 5. 



