in Hybridisation 77 



12 feet high, and yellow coloured pods, constricted when 

 ripe. The ratios of the numbers in which the different 

 forms appeared in the separate generations were the same 

 as with Pisum. Also the development of the constant 

 combinations resulted according to the law of simple com- 

 bination of characters, exactly as in the case of Pisum. 

 There were obtained 



Constant Axis Colour of Form of 



combinations the unripe pods. the ripe pods. 



1 long green inflated 



2 constricted 



3 yellow inflated 



4 ,, constricted 



5 short green inflated 



6 ,, constricted 



7 yellow inflated 



8 constricted 



The green colour of the pod, the inflated forms, and the 

 long axis were, as in Pisum, dominant characters. 



Another experiment with two very different species of 

 Phaseolus had only a partial result. Phaseolus natius, L., 

 served as seed parent, a perfectly constant species, with 

 white flowers in short racemes and small white seeds in 

 straight, inflated, smooth pods ; as pollen parent was used 

 PL multiftorus, W., with tall winding stem, purple-red 

 flowers in verj^ long racemes, rough, sickle-shaped crooked 

 pods, and large seeds which bore black flecks and splashes 

 on a peach-blood-red ground. 



The hybrids had the greatest similarity to the pollen 

 parent, but the flowers appeared less intensely coloured. 

 Their fertility was very limited; from seventeen plants, 

 which together developed many hundreds of flowers, only 

 forty-nine seeds in all were obtained. These were of 



