300 



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



colour ; magenta colour introduced into the tube takes the same concentration 

 as that in the lips. 



Experiments of Be Tries on Antirrhinum. 

 In the ' Mutationstheorie,' Lief. IV, pp. 194 — 206, Professor De Vries gives 

 an account of experiments in crossing certain varieties of Antirrhinum majus. 

 It is stated that yellow colour was not taken into consideration and experi- 

 ments were confined to the white and red varieties. The following is a 

 description of the types mentioned : — 



Eoth Tube and lips red, the lips deeper 



Fleischfarbig . . . Tube and lips pale red 



Deiila Tube pale or white, lips fairly deep red 



Weiss White, often with a distinct very pale red tinge 



Professor De Vries regards red as being made up of fleischfarbig F and 

 delila D, two dominant characters, and white as producing two characters, w 

 and w', recessive to F and D respectively. 



A red Antirrhinum was crossed with white, giving an Fi like the red 

 parent. From the Fi cross-breds on selfing, four types were obtained : — the 

 original red, delila, flesh-colour, and the original white, roughly in the 

 proportions 9:3:3:1. This result would be represented : — 



Eed x white 

 FD x ww' 



FDww' Eed cross-bred 

 The cross-bred x self would give : — 







Ratios. 



Per cent. 



FD 



Red 



9 or 



3 



3 



1 



56 



19 



19 



6 



F 



D 



Flesh-colour 



Delila 





White 







Total 



16 



100 



The numbers resulting from three experiments were :- 



Red 



Flesh-colour . . . 

 Delila 



51 

 16 

 31 



2 



58 



17 



20 



4 



58 

 11 

 21 

 10 



White 



Totals 



100 



99 



100 



