348 



not pretend to understand or explain this quality of tlie spores 

 i)ut it is a fact that everyone can test. 



If we examine spores in a drop of water under a microscope 

 we can often see them covered by a more or less distinct gelati- 

 aious layer. Perhaps this cover, even when not steeped in water, 

 is sufficiently moist and adhesive to glue the spores to the object 

 with which they come into contact. 



