500 



THE BEGINNINGS OF LIFE, 



Remarks upon some of the 'Developmental Tendencies of 



Ciliated Infusoria^ and upon the different Modes of 

 Origin of Rotifers^ lardigrades^ and Nematoids. 



But just as the Ciliated Infusoria are often only higher 

 developmental states of portions of living matter which 

 have previously existed in a simpler condition, so they 

 themselves very frequently become transformed into 

 more complex living types. Dr. Gros pointed out these 

 highly important facts more than twenty years ago, 

 when^ after speaking of Actinophrys, he said: — *^Les 

 utriculeux cilies, Vorticelles, Ptesconiens, Oxytriqucs, 

 Kerones, Dileptus, Coccudina, Nassula, etc, recon- 

 naissent aussi une origine vesiculaire vegeto-animale. 

 En general, ils tendent aussi a Tascendance et beau- 

 coup (pourquoi pas tous?) se convertissent en Rota- 

 toires minuscules, qui peuvent continuer Tcchelle as- 

 cendante ou rester dans le cercle des Cilics. Bon 

 nombre d'Utriculeux, selon leur derivance, s'en tien- 

 nent a tourner dans leur monde proteen et tortueux, 

 Les agents exterieurs^ la forme et la grandeur dcs vas^s 

 sont tres-puissants sur leur evolutions/ 



The various forms of Ciliated Infusoria, in fact, 

 whose mode of origin may be so different on different 

 occasions, after living for a time a life of great activity. 



during which 



may give 



birth to other similar 



creatures by processes of fission and external or internal 



gemmation, at 



last encyst themselves in a manner 

 which has been so often described. Within this cyst 



i out, the e 



ro^^c-t of mo 



> 



i 



jl-so that ultin 

 _;ro of one or 



I 



iaiormation, ; 

 :: occasionally 

 :. He says - :- 

 ins, !cs Di 1( 



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 -ic), et 



■v. 



m 



-i^where h 





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'i-tnes pp^^s . ., 



porent 



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quelqi 



n 



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T' 



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■"« Rotifer- 





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