in Hybridisation 





Experiments with Hybrids of other Species of Plants. 



It must be the object of further experiments to ascertain 

 whether the law of development discovered for Pisum 

 applies also to the hybrids of other plants. To this end 

 several experiments were recently commenced. Two minor 

 experiments with species of Pliaseohis have been completed, 

 and may be here mentioned. 



An experimimt with Pliaseolus vulgaris and Phascolus 

 nantis gave results in perfect agreement. Pli. nanus had 

 together with the dwarf axis, simply inflated, green pods. 

 Ph, vulgaris had, on the other hand, an axis lo feet to 

 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 

 combinations 



I 

 2 



3 



4 



5 

 6 



7 

 8 



Axis 



long 



short 

 >» 



1) 



Colour of 

 the unripe pods 



green 



yellow 



green 



yellow 

 >» 



Form of 

 the ripe pods 



inflated 

 constricted 



inflated 

 constricted 



inflated 

 constricted 



inflated 

 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. Pliaseolus nanus, L., 

 served as seed parent, a perfectly constant species, with 

 white flowers in short racemes and small white seeds m 

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

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

 flowers in very long racemes, rough, sickle-shaped crooked 

 pods, and large seeds which bore black flecks and splashes 

 on a peach-blossom-red ground. 



