S. C. Harland 217 



From these results it may be concluded that B and S are indepen- 

 dently inherited. • 



Relation between the factors G (green), and B (bloom). 



The relation of G and B was investigated in the back-cross 

 Gg Bb X gb gb. The following were the results : 



Family GB Gb gB gb 



It will be seen from these results that GB and gb are in excess of 

 Gb and gB. By Morgan's method of calculation the percentage of 

 crossing over between G and B is 462, practically independent in- 

 heritance. 



With such a small series of numbers it would be unsafe to assume 

 that G and B are linked, but the results indicate the need for further 

 experiments. 



The relation between the factors M (mahogany), and B (bloom). 



In the cross green, bloom, by mahogany, no-bloom, it was noticed 

 that the combination green, no-bloom occurred only once among a large 

 number of F^ plants. Since the cross is GB m x gb M it is clear that 

 the combination mb, i.e. green, no-bloom, and tinged, no-bloom should 

 occur once in sixteen times if M and B are independently inherited. 

 The F^ results are placed below. 



These results indicate that factors B and M are repelled, though no 

 attempt will be made to calculate the theoretical gametic series from 



