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



From Case 2 : — 







Ratios. 



Numbers 

 calculated. 



Numbers 

 observed. 



TYL 



y L 





3 or 39 -00 

 1 13 -00 



35 

 17 



„ delila... 





Totals 



4 52 -00 



52 



From Case 3 :- 







Ratios. 



Numbers 

 calculated. 



Numbers 

 observed. 



LY 



y 



Crimson delila .. 

 Yellow 



3 or 21 -00 

 1 7-00 



20 

 8 







Totals 



4 28 -00 



28 



And from Case 4 we should get crimson delilas only, which agrees with th& 

 experimental result. 



In Case 1 there are theoretically 4 kinds of F 2 crimsons ; 10 plants taken 

 at random gave 3 kinds. (Table VI gives F 3 for Case 1.) 



Of crimson delilas there are two kinds ; both were given by 4 plants. 



Yellows are of 1 kind only ; 8 yellows gave yellows only. 



Crimson Delila x Crimson : — 



The crimson delila parent was breeding true. The crimson parent was. 

 shown to be hybrid as regards T, giving, on selfing, 3 crimsons to 1 crimson 

 delila. 



Fi consisted of crimsons and crimson delilas. (Table I.) 



Y 2 — Three crimson delila cross-breds gave crimson delilas only. F 2 has not 

 yet been obtained from the crimsons. 



If we assume the parents to be : — 



YY ii LL Tt Crimson 



YYiiLLtt ... „ delila, 



the cross-breds would be : — 



YY ii LL Tt Crimson 



YYiiLLtt „ delila, 



whole forms and delilas in equal proportions, and the latter would give 

 crimson delilas only on selfing, which agrees with the experimental results. 



