PHYSIOl-OGY OF THE MICROBES 103 



they present those phenomena of strict adaptation which are 

 equivalent as between the soil or the host and the parasite — to 



a sporoioite int'odinff the 

 epUhelial cellr and becoming 

 adult 



fbrmalwn ajid discharge 

 pfl/u sporozDiles 



a microejamele ''' 

 fi'rtihsUig a nmcrogamete 



formaUon ormicrvgameles ,es 



Fig. 39. — Life cycle of a Coccidium (Coccidium Schubergi). 

 (After Schaudinn.) 



true specificities : they cannot endure any other habitat, food, 

 or host. 



For example , Costia necatrix which lives attached to the 



