S. C. Harland 223 



(c) Segregating into purple and white in the 3 : 1 ratio. 



In regard to the behaviour of the white flowered plants in ^3 it may 

 be stated briefly that twenty-five families were grown containing 716 

 plants — all of which were white. 



The F^. Several families were continued into ^4. The results may 

 be set forth as follows : 



Semes 64. Family 64 threw 24 purples and 1 1 whites in F^. Assuming 

 that the t3rpe of ratio in this family is 3-1, it is to be expected that of 

 every 3 purples 2 will segregate into purple and white in the 3-1 ratio, 

 and 1 will breed true. The whites will breed true. Of 6 families from 

 F^ purples, 3 bred true (344 plants), and 3 segregated into purple and 

 white in the 3-1 ratio, the actual numbers being 80 purple and 35 

 white. From F^ whites 4 families containing 129 plants were grown. 

 All the plants were white flowered. 



Series 63. Family 63 belonged to the 3-1 type of segregation, having 

 thrown 36 purples and 7 whites in F^. In ^4 sixteen families were grown : 



(a) Of 12 families from purples, 9 segregated into purples and whites 

 in the 3-1 ratio (99 : 41), while 3 families bred true (58 plants). 



(b) Of 4 families from whites, all bred true (52 plants). 



It is to be regretted that no F3 families which showed the 9 : 7 type 

 of ratio were continued into F^. 



