Transmission z's. Development of Characters 109 



which there is, at first, an increase in number, until, at 

 last, from some of them the sexual organs develop. There- 

 fore the cells on the main germ-tracks are here not dis- 

 tinguished by any visible characteristic from the purely 

 vegetative cells. The same is true of the already repeatedly 

 mentioned pseudo-somatic germ-tracks of the begonia. 



Everywhere we are confronted with the statement of 

 Darwin, quoted above, that the transmission and the de- 

 velopment of hereditary characters are different powers. 

 In the cell-pedigree they run almost nowhere parallel. 



