f 



TOBACCO AND PURE AIR 13 



stems are saved for greenhouses all over the country. 

 It seems that once every two weeks he himself uses 

 these stems for small bonfires up and down all the 

 straight rows of his greenhouse. 



He takes an armful for each fire, spreads it out a 

 little on the ground, lights it, and shuts every door and 

 window to keep the smoke in. 



After a while the room is so full of smoke that he 

 cannot stay in it a minute himself because it makes him 



; 







SMOKING OUT THE INSECTS 



deathly sick. But the bugs and the worms have shorter 

 legs ; they cannot run away. When, therefore, the stuff 

 is burned up and the fires have smoked out, and the man 

 goes in again, he generally finds the insects all dead. If 

 some are alive, he gives them another big smoke the next 

 day, and they never live to eat any more. Smoke from 

 an ordinary bonfire would not do this. 



