HOW PLANTS TAKE FOOD FKOM AIR 119 



deadly poison to the entire vegetable kingdom 

 delicious food. Great as is the daily supply, it is 

 only sufficient for daily bread to the hungry Vege- 

 table World. It goes out of the air as fast as it 

 comes in. The Vegetable World is thus fed, so the 

 air is kept pure. 



