292 



Miss M. Wheldale. The Inheritance of [Feb. 12, 



L, and T in Antirrhinum, none of which produce a sensible effect unless yellow 

 is also present. Any of these may be carried by an albino. 



The factor I modifies yellow, giving ivory. The factor L, superposed upon 

 ivory, gives magenta ; with yellow it blends, giving crimson ; finally, the third 

 factor T is not manifested unless L in addition is present. 



Details of Various Matings. 

 White x other Types. 



White x Yellow Crimson-striped : — 



The type yellow crimson-striped is, as explained above, really crimson, in 

 which the magenta sap occurs in irregular stripings and fleckings, so that the 

 lips appear yellow striped with crimson and the tube ivory striped with 

 magenta ; a corresponding delila form exists, having an ivory tube. 



White has always been found to breed true, but the sellings of the other 

 parent unfortunately failed, so that its constitution can only be deduced from 

 the results of crossing. 



Ei consisted of magentas and magenta delilas (Table I, p. 303). 



F 2 — The cross-breds appeared to be of four kinds, giving respectively, on 

 selfing : — 





Case 1. 

 Magenta x self. 



Case 2. 

 Magenta x self. 



Case 3. 

 Magenta delila x self. 



Case 4. 

 Magenta delila x self. 



Magenta 



107 

 42 

 42 

 12 

 67 

 24 

 80 



229 

 70 

 74 

 19 



97 



59 



18 



19 



7 



34 



47 

 5 



19 



„ delila... 



„ delila ... 



Yellow 



White 





Totals 



374 



489 



137 



71 



If we assume the original parents to be : — 



yyHLLtt White 



YY ii LI Tt Yellow crimson-striped, 



then the cross-breds would be of four kinds : — 



Yy Ii LI Tt Magenta (Case 1) 



YyliLLTt „ (Case 2) 



Yy Ii LI tt „ delila (Case 3) 



Yy Ii LL tt „ „ (Case 4), 



