with Hieracium 103 



In Plsum the hybrids, obtained from the immediate 

 crossing of two forms, have in all cases the same type, 

 but their posterity, on the contrary, are variable and 

 follow a definite law in their variations. In Hieracium 

 according to the present experiments the exactly opposite 

 phenomenon seems to be exhibited. Already in describing 

 the Pisum experiments it was remarked that there are 

 also hybrids whose posterity do not vary, and that, for 

 example, according to Wichura the hybrids of Salix 

 reproduce themselves like pure species. In Hieracium 

 we may take it we have a similar case. Whether from 

 this circumstance we may venture to draw the conclusion 

 that the polymorphism of the genera SalisB and Hieracium 

 is connected with the special condition of their hybrids is 

 still an open question, which may well be raised but not 

 as yet answered. 



