HYBRIDIZATION 439 



In the formation of simple hybrids, as in sexual propagation in gen- 

 eral, two factors are functional; this inequality of activity flowing out 

 of the specific difference of species, expresses itself in the more marked 

 or the more feeble emergence of the individual paternal characters in 

 the different parts of the hybrid. Whether the species nature in its 



of the type, or whether also the individual parts of plants have a special 



investigations (p. 257). 



In the absence of what he deemed sufficient evidence to 

 the contrary, Gartner conservatively adhered to the view 

 that the parent organism entered into the cross as a 

 whole, rather than as a congeries of character-units, be- 

 having in a manner separately, although often linked 

 together. 



Eegarding the recognized instability of hybrids, Gart- 

 ner simply says, without distinguishing as to the gen- 

 eration : 



hybridity (p.518). 



So far as any distinction as between the first and sec- 

 ond generation is concerned, Gartner merely says: 



Concerning vari;i1)ilily in hybrids of the second and 

 succeeding generations, he says: 



Other hybrids, and in fact the most of tliem which are fertile, present 



less (]>. .lL-_')." 



Perlin[)s ihv most delinite alkision describing the con- 



