220 , Natural Salvation. 



as if worn out, worthless, or deleterious. The remaining 

 parts of the paranuclei then come together and are 

 differentiated as a male and a female pronucleus. All 

 this seems to take place as if under stimulus of contact, 

 or of sexual desire between the two cells. Having paired, 

 these changes in each begin and proceed as above indi- 

 cated. Immediately then the male pronuclei cross over 

 from cell to cell, the female pronuclei remaining 

 stationary. After passing over, the male pronuclei 

 unite and fuse, each with the resident female pronucleus. 

 A transfer and exchange of germinal matter from one cell 

 to another is thus accomplished. 



Following this exchange, a complete reconstruction and 

 reorganization of the entire nucleus of both cells takes 

 place. And now the two unicells, having affected this 

 swap-over of germinal matter, and this profound recon- 

 struction, slowly separate to go each its individual way 

 as before. Each feeds and grows ahd in due time begins to 

 multiply by fission and division in halves, which form 

 new individuals; and this asexual increase may go 

 on for fifty, a hundred, or even six hundred generations. 



Maupas' observations indicated that sexual conjugation 

 did not take place successfiilly between unicells of the 

 same family, that is, between descendants of the same 

 parent cell. The disadvantages and observed enfeeble- 

 ment, which result from inbreeding in animals, and in 

 consanguineous marriages, appear theiefore to be deep- 



