212 



PARASITISM 



lioma spores of the fern lycopodium, which were probably introduced 

 with a face powder, were found. All such organisms, finding a favor- 



FIG. 85 



15 



ar>Sla 



e WL 



^^ rv-v 



18 ^ji&t 



/li*-. '-v.J**C.>-ST. 



^i^w 



WfcSfif* 



Types of the cell inclusions found in human cancer. (After Calkins.) 



