154 Life and Love. 



~--^- \ — ^r»V Doubtless there was orig- 



""^^^^^^jJ^ inally but one sex, — from 

 •l/ the simple substance of the 



,v' simple creature were budded reproduc- 

 es tive cells capable of developing with- 

 *^ out union with other cells. Gradually, 

 ,£' as the life became more complex, 

 '*, there was a division into two sexes. 

 |\ Hints of the original one-sex method 



"- still linger in curious and instructive 

 i^ abundance, however, — certain creatures 

 ^^^ Still reverting to it upon occasion ; some 

 ■fee insects, for instance, at certain seasons 

 '^•^^ of abundance laying eggs which de- 

 ^^^ velop without fertilization, while at 

 ^A'3" other seasons, of diminished abundance, 

 ^-^ the eggs are always fertilized. 

 "^Tf^x\ There are crustaceans which have the 



/• , .^* habit of laying eggs capable of devel- 

 .i7',0 oping without fertilization, and high up 

 \.':!'f^%' in life, even to the mammals, there 

 '' ' have been observed the first changes 





(/.Al\^/ in the unfertilized egg, — changes 



which usually 

 take place only 

 after fertiliza- 

 tion. These 

 changes pro- 

 ceeded but a 

 little way, how- 

 ever, never de- 

 eping into the later stages. 



