civ THE BEGINNINGS OF LIFE. 



evolution, however, occurs in these crea- 

 tures, as previously explained, at a more 

 advanced stage of their developmental 

 cycle. 

 IV. Reproduction by the formation of Germs, in the sub- 

 stance of the organism, which have no genetic relation- 

 ship to the ' Nucleus.' 



a. According to Perty, ovules are produced in 

 large numbers in certain Infusoria. He says 

 he has seen a specimen of Amphileptus 

 moniliger distended with from looto 150 

 minute germs. Paramecium versutum has 

 also been seen by the same observer to 

 contain a number of greenish ovules. (Mr. 

 Carter, and a few others, adopt these ob- 

 servations of Perty, though the larger 

 number of naturalists seem inclined to 

 throw doubt upon them, or to deny that 

 such bodies are ovules.) 

 h. Eckhard recorded \ with great precision, the 

 mode of evolution and discharge of three 

 ovules, in Stentor ccerukus, which made 

 their appearance as minute granular glo- 

 bules. He described the mode of forma- 

 tion of the mouth, the evolution of 

 cilia, and the appearance of contractile 

 vesicles. These observations have been 

 confirmed by Oscar Schmidt. In Stentor 

 polymorphus, Eckhard has also seen 

 similar globules within the body, though 

 he has not watched their development and 

 exit. 



1 ' Ann. of Nat. Hist./ 1846, vol. xviii. 



