FUNCTION OF COLOTJR AND SMELL IN FUNGI. 167 



fungus have been established, it would seem, by slow degrees 

 in response to certain demands, objective and subjective. By 

 their possession each species is better able to attract the 

 quadruped, bird, or insect, as the case may be, within which, or 

 on the living tissue of which, it is necessary that it should pass 

 a phase of its existence. 



