THE MONTHLY BULLETIN. 



331 



DOSAGE. 



The amount of cyanide used depends upon the pest to be treated. 

 Accordingly several schedules (Figs. 317, 318) have been made, based 



Di.stance around tre&. 



Fig. 31 1 



-Schedule No. 



1. The ttrst few dosages should be doubled. 

 (U. S. Dept. Agrcl.) 



upon dosage schedule No. 1 for purple or red scale made by R. S. 

 Woglum. This dosage consists of one and a half ounces of potassium 

 cyanide to every one hundred cubic feet of air space. The schedule 

 dosage for black scale usually consists of three fourths of schedule 

 No. 1 and is designated dosage schedule No. f . 



If sodium cyanide is used the dosages are reduced 25 per cent. 



Black Scale.— Either dosage schedule No. f or ^ for potassium 



