Chap. XIII. 



EEVEESION. 



49 



traversal tendency to reversion in successive hybrid generations 

 For this would be the natural result of the union of pollen and 

 ovules, m both of which the elements of the same species had 

 been segregated by self-affinity. If, on the other hand, pollen 

 which included the elements of one species happened to unite 

 with ovules including the elements of the other species, the 

 intermediate or hybrid state would still be retained, and there 

 would be no reversion. But it would, as I suspect, be more 

 correct to say that the elements of both parent-species exist in 

 every hybrid in a double state, namely, blended together and 

 completely separate. How this is possible, and what the term 

 specific essence or element may be supposed to express, I shall 

 attempt to show in the hypothetical chapter on pangenesis. 



But Naudm's view, as propounded by him, is not applicable 

 o the reappearance of characters lost long ago by variation; 

 and lt is hardly applicable to races or species which, after having 

 been crossed at some former period with a distinct form, and 

 having since lost aU traces of the cross, nevertheless occasion- 

 ally yield an individual which reverts (as in the case of the 

 gre^at-grandchild of the pointer Sappho) to the crciLg 

 ioim. The most simple case of reversion, namely, of a hybrid 



erfeHSl tS T dParentS ' * """ * « *"* S£ 

 series with he extreme case of a purely-bred race recoverinp- 



ttuTLftotf I S7T r dJng ma » y *»* "- 



"bona ^ aU ^ ^ ^ b6 "*" V -me 



hiSv Xl elie VK-f at ° nIy th0S6 hybrid P Iants ***> •» 

 forms" It h f T y , tendenCy *° "^ to *»"* P^t- 



S:i m Z 7th n° k d °b U e bt an £? " T™' ** ^ ^ 

 accounted for h Y Z\lrT f T" "* " *"* V ^ S be 

 for he admits tW 1 TT ^ geUera observed h Y h ™, 



^i^T^ZZi^ f erent genera Th * 



and bv the mlZ I C °" tradlcted h Y Naudin's observations, 



b?t til £:z "tXj My fertile mongrels e ^ : 



according to Gartner l^Zt^^ * ^ ^ 



Gartner further states ih»+ «« 



fewies that reversions rarely occur with 



V0L> n ^ ' Bastard er Z e Ugung/ s . 582j ^ &Q 



E 



