PARTHENOGENESIS 215 



generation alternates with a parthenogenetic one. Where a nonsexual genera- 

 tion, as by division or budding, alternates with a sexual one the process is called 

 metagenesis. In parthenogenesis reproduction eggs develop without the occurrence 

 of fertilization by spermatozoa. 



In coccidiosis we have a sexual cycle (sporogony) alternating with a nonsexual 

 one (schizogony). In the infection with Strongyloides we have a sexual cycle 

 alternating with a parthenogenetic one. In malaria we have a sexual generation, 

 a nonsexual one and according to Schaudinn, a parthenogenetic one, which latter 

 accounts for malarial relapses. 



