BEFORE DARWIN AND AFTER. 471 



acceptation, is to be regarded as having the 

 duration of Earth-life, with which it begins 

 and ends. It is a kind of string on which has 

 been strung and will be strung all living forms 

 from the first terrestrial Life to the last. 

 Moreover, each individuated germ-cell is a 

 very complex thing, bearing in itself thou- 

 sands of transmitted characters, each of which 

 is declared to be a unit in itself and may rise 

 to the surface in heredity. 



Using terms already employed (180) we 

 observe that the organism manifests all three 

 kinds of genesis, Homogenesis (like produces 

 like), Heterogenesis (like produces unlike 

 De Vries) ; to these we may add the Darwin- 

 ian doctrine of Homoiogenesis (like produces 

 similar). These doctrines often held separ- 

 ately, are seen to be united in the Mendelian 

 experiments. That is, an organism may pro- 

 duce all three kinds likes, unlikes, and simi- 

 lars. (See a very striking colored illustra- 

 tion of this fact in Prof. Bateson's work on 

 Mendel's Principles of Heredity, in the flower 

 Primula Sinensis, which by crossing is made 

 to show vividly the Mendelian process domi- 

 nance, recession, and recurrence and also in- 

 dicates by unique coloration of various 

 shades the three kinds of genesis like, un- 

 like, and similar, (pp. 294-5.) 



The chief interest here is to observe the 



