in Hybridisation 53 



Experiment 1. Experiment 2. 



Form of Seed. Colour of Albumen. 



As extremes in the distribution of the two seed charac- 

 ters in one plant, there were observed in Expt. 1 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 1 green seed, but also one of 20 yellow 

 and 19 green. 



These two experiments are important for the determ- 

 ination of the average ratios, because with a smaller 

 number of experimental plants they show that very con- 

 siderable 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 the partial disappearance of the 

 green colouring has no connection with the hybrid-character 

 of the plants, as it likewise occurs in the parental variety. 

 This peculiarity is also confined to the individual and is 

 not inherited by the offspring. In luxuriant plants this 

 appearance was frequently noted. Seeds which are damaged 

 by insects during their development often vary in colour 

 and form, but, with a little practice in sorting, errors are 



