i8o 



RESEARCHES ON FUNGI 



It is also evident that the dryer the air, the more slowly do 

 the spores fall. At the same distance from the gills, for CoUyhla 

 dryophila, the velocity of fall in a dry chamber was only about 



CollyJiia rfyi/ophila 



Polyporus squamosus 



Psalliota campestris 



one-half of that in a moist chamber contaiiiing wrt M()ttiiin-pa[)cr. 

 In the most dried condition the spores Avere falling at only one- 

 third the speed at which they fell in the most moist condition. 

 The obvious explanation of the decrease in speed of spores 



