The European Trenches Are Not the Only 



Gas masks a new development? Hardly. 

 They have been used for years in American 

 industries. At the left a girl is shown 

 putting caps on bottles of disinfectants 



Foreign cotton has to be disinfected 

 to kill the boll weevil. Here it is 

 treated with hydrocyanic gas, pumped 

 at a pressure of 1,000 pounds a square 

 inch. A whiff of the gas is fatal 



Handling barrels of chloride of lime 

 which gives off an irritating dust pow- 

 der and chlorine gas, the destructive 

 gas used in trench warfare. The 

 men are well protected by their masks 



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