374 W. Bateson. 



The list shows how various are the characters which have a 

 Mendeliau inheritance. Though only simple cases are included the 

 features concerned are so multifarious and the types affected so dissi- 

 milar that it is evident that we are in the presence of a principle 

 of wide and general application. In addition to the cases given in 



Fig. 7. Fern (R). Two varieties of Primula Sinensis, the palmatifid is the wikl 

 tj'pe aud is dominant to the pinnatilid. The latter arose in cultivation abont 1860. 



this list there are numbers of other examples in which it is practi- 

 cally certain that similar principles are followed. Some of these are 

 obscured by various attendant circumstances, and in others the evi- 

 dence has not yet been collected on a comprehensive scale. 



Before proceeding to consider the more complex phenomena of 

 Mendelian inheritance some general considerations call for notice. 



Domiiiauce. 



In the cases given in the list dominance is practically universal 

 and more or less complete. Experiment however has revealed very 



