RESULTS OF HYBRIDISATION 



389 



meaning of this white, with colourless corpuscles in colourless 

 sap ? 



Parents 



Red variety x Cream variety 



" Which are the factors which segregate in the formation of 

 the germ-cells ? They are [a] red sap from colourless sap, and 

 (&) white corpuscles from yellow corpuscles ; so that when the 

 possible combinations of these two pairs of characters are made, 

 colourless corpuscles may coincide with colourless sap and a 

 white flower is the result " (Bateson, 1906). 



Summary. — There are several well-known results of hybridisa- 

 tion: 



1. The hybrids maybe an intermediate blend of the parental 



characters, as in mulattos, finch and canary, carrion 

 crow and hooded crow, and in many plants,— 



^ . , , AB 



A X B yields 



2. The hybrids may show a particulate juxtaposition with- 



out a blend of the parental characters, as in piebald 

 animals, or in cross between male Lady Amherst 

 pheasant and female golden pheasant, — 



. ,, A + B 



A X B yields 



3. The hybrids may resemble an ancestral form, whose 



characters have not been recently patent, as in many 

 crossings of pigeons, red-eyed albino house-mouse and 

 Japanese waltzing mouse (with progeny like wild 



