FRUITING OF MOLDS 



43 



Plate I 



Plate II 



Fig, r8. Plates exposed to the air before and after 

 • sweeping, showing the abundance of mold spores 

 in the air. The upper plate was exposed before 

 sweeping, and contains one mold; the lower after 

 sweeping, and contains numerous molds. Each 

 was exposed for one minute. 



