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 Ama>ba 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 



