INDUSTRIAL FUMIGATION AGAINST INSECTS 



41 



-2 3 

 ■ *>< 



cO 



gas 



- n u 



3«l 



•r 3 





• r- o 





"3 --r 



3) -Jr V 



— B > 



2=c 

 -2 b0„ 



*£ 



o~2 

 ■ g-S 



go 



s»fs 



Sh = 3 



ill 



