in Hybridisation 345 



seeds were round (Expt. i) or all yellow (Expt. 2) ; on the 

 other hand there were never observed more than five 

 wrinkled or five green ones in one pod. It appears to 

 make no difference whether the pods are developed early or 

 later in the hybrid or whether they spring from the main 

 axis or from a lateral one. In some few plants only a 

 few seeds developed in the first formed pods, and these 

 possessed exclusively one of the two characters, but in the 

 subsequently developed pods the normal proportions were 

 maintained nevertheless. 



As in separate pods, so did the distribution of the 

 characters vary in separate plants. By way of illustration 

 the first ten individuals from both series of experiments 

 may serve. 



Experiment i. Experiment 2. 



Form of Seed. Colour of Albumen. 



Plants Round Angular Yellow Green 



1 45 12 25 ii 



2 27 8 32 7 



3 24 7 14 5 



4 19 10 70 27 



5 32 ii 24 13 



6 26 6 20 6 



7 88 24 32 13 



8 22 10 44 9 

 928 6 50 14 



10 25 7 44 18 



As extremes in the distribution of the two seed characters 

 in one plant, there were observed in Expt. i an instance of 

 43 round and only 2 angular, and another of 14 round and 

 15 angular seeds. In Expt. 2 there was a case of 32 

 yellow and only i green seed, but also one of 20 yellow 

 and 19 green. 



These two experiments are important for the determina- 

 tion of the average ratios, because with a smaller number 

 of experimental plants they show that very consider- 

 able fluctuations may occur. In counting the seeds, also, 

 especially in Expt. 2, some care is requisite, since in some 

 of the seeds of many plants the green colour of the albumen 

 is less developed, and at first may be easily overlooked. 

 The cause of this partial disappearance of the green colour- 

 ing has no connection with the hybrid-character of the 



