xxxvi Proceedings. [March 21st, ipid. 



of this plant, while two other forms are covered by one or by 

 two layers respectively of the nightshade. As this apparent 

 covering of one plant by a mantle of another differs essentially 

 from the intimate intermingling of characters usually met with 

 in seed hybrids, it has been suggested by Baur that the term 

 " Chimaera " is more appropriate than " hybrid" for the curious 

 growths resulting from special conditions in grafting. Baur also 

 concluded that the so-called hybrid which has been obtained 

 by grafting the medlar upon the hawthorn is probably also a 

 " periclinal chimaera." 



On the other hand one of Winkler's productions Solatium 

 Darwinianum may be a true hybrid resulting from the intimate 

 union of both plants probably with nuclear fusion, as seems 

 likely from the number of its chromosomes. 



Lucien Daniel has also described some intermediate forms 

 resulting from the grafting of pear upon quince, and peach 

 upon almond. In these cases as the intermediate shoot arose 

 at some distance from the graft, in the former case on the roots 

 of the quince, in the latter case upon the branches of the peach, 

 it would seem that they cannot bechimaeras, more particularly 

 as the intermediate characters are often found in deeply-seated 

 parts as in the stone of the hybrid between almond and peach 

 (Amygdalo-persica). In the hybrid between the pear and the 

 quince (Piro-cydonia), one of the characters (hairiness) is also 

 more strongly marked than in either of the parents. 



It seems probable, therefore, that " graft hybrids " do not 

 represent one form of vegetative union only, but that fusion of 

 two different individuals can take place in more than one way. 



Similarly in seed hybrids the characters of the parents may 

 probably be associated with one another in a variety of ways. 



