248 INSECTS 



time no living creature not in the egg state will remain, 

 and the house can be opened to admit fresh air and 

 permit the escape of gas. If windows can be opened 

 from the outside or a through draft can be obtained, a 

 few minutes will answer, and if a scuttle can be opened 

 from the roof, the entire house will be safe in half an 

 hour if all the doors in the halls are open. 



The directions for use here are much more formi- 

 dable than the actual work ; but the danger to life is so 

 great if proper care is not exercised, that undue pre- 

 cautions are recommended rather than general direc- 

 tions that might promote carelessness. 



