FRUITING OF MOLDS 



23 



Plate I 



Plate 1 1 



Fig. 18. Plates exposed to the air before and after 

 sweeping, sliowing tlie abundance of mold spores 

 in tlie air. The upper plate was e.xposed before 

 sweeping, and contains one mold; the lower after 

 sweeping, and contains numerous molds. Each 

 was exposed for one minute. 



