PARTHENOGENESIS IN PLANTS. 309 



served in a large number of i^lants, a list of which, with 

 the observer of the phenomenon, we subjoin : — 



Chakace^ — Char a crinita. A. Braun. 

 Cannabine^ — Cannabis sativa. Nauclin. 

 CHENOPODiACEiE — Spifiacea oleracea. Le Cocq, 

 EuPHOEBiACE^ — Ccdebogijne Ilicifolia. J. Smith ; 



Mercurialis, species. Naudin. 

 Anaecardiace^ — Pistacia Narhonensis. Tenore ; 



Pistaciw, species. Bocconi. 

 CucuRBiTACE^ — Bryonia diocia. Naudin. 

 Datisce^ — Datisca cannahina. Fresenius.'' '"' 



To this list may be added the Algce, in which Pring- 

 sheim has observed the same phenomenon. -j- 



Such were the facts known at the time when I re- 

 sumed my investigation of Polype -parthenogenesis. 

 The labours of distinguished naturalists on the genesis 

 of Polypes may be summed up in the following 

 schema : 



A. The Medusa parent i^roduces ova ; 



B. These ova are developed into infusoria ; 



C. These infusoria are developed into Polypes ; 



D. These Polypes produce, hy budding, the Medusse, 

 which in turn p)'i^oduce ova. 



Thus D completes the cycle commenced at A. As 

 variations from this route we have — 



a. The Medusa produces Medusas by budding ; 

 /3. The Polype produces Polypes by budding 



'& 5 



* Lankester : in Microscopical Journal, No. XX., July 1857. 

 t Anriales des Sciences Xaturelles. 1856. 



