THE MULTIPLICATION OF ANIMALS AND SEX 53 



spontaneous generation of organisms, and that all the ani- 

 mals whose life history we know are produced from other 

 animals of the same kind. " Omne vivum ex vivo" All life 

 from life. 



FIG. 26.- The multiplication of Amoeba by simple fission. 



30. The simplest method of multiplication. In our study 



of the simplest and the slightly complex animals we became 



acquainted with the simplest methods of multiplication 



and with methods which are more complex. The method 



5 



