FUMIGATION AGAINST GRAIN WEEVILS 



29 



ume (equivalent to 79.1 per cent and 20.9 per cent by weight) gives 

 off a highly inflammable vapor. The use of such a mixture to kill 

 weevils or other insects is condemned as dangerous. 



A mixture of carbon tetrachloride and carbon disulphide containing 

 as little as 5 per cent by volume of carbon disulphide will flash at 

 20° C, although it will not continue to burn. 



0SO 

 0OO 

 7SO 





























































ii 

 U 



6SO 

 \ 



% soo 



\ 



%sso 



X 



\soo 



X 



1, 







































I 



ll 

 1 



















1 

 ll 





















II 



u 

 ll 



















d 



11 



















v/7 



Sh 



















I 



iff 



p 





\soo 















k 





















¥ 







^2>SO 



\ 



^200 

 /SO 

 /00 













A 



















/ 



/y 

 // 



















4 



> f 

















^ 



S 













SO 



E^^^^ 





&& 

















-<ZV -/O O /O ZO SO 40 SO 60 7& 0O 



r^Ar^B^^T^/^e^ °c 



Fio. 1.— Vapor pressures of < Ur, 1 ■■■'■> -i.:it<; and carbon tetrachloride (Table 9). 



