THE TIGRIDIA 153 



plant, as demonstrated by the fact that flowers, 

 for example, of different colors may be borne on 

 plants grown from a single seed pod. 



So if we are to present the matter quite in its 

 true light we should say that the aggregate pol- 

 len product and ovule product of a plant must 

 be considered as representing the personality — 

 that is to say, the hereditary complex — of the 

 plant. 



No single pollen grain and no single ovule 

 contains representatives of all the types of hered- 

 itary factors that are present in the heredity of 

 the plant as a whole. 



Stated otherwise, the pollen grains and ovules 

 are very specialized and concentrated portions of 

 matter, each of which contains a similar equip- 

 ment of the most fundamental of the hereditary 

 factors, but each of which contains a somewhat 

 different assortment of the less fundamental ones. 



All the plants that grow from the seed of a 

 Tigridia, for example, will be unequivocally 

 Tigridias in stem and leaf. But there will be 

 minor differences among them as to details of 

 size, as to freedom of flowering, as to precise 

 size of flower, and as to the exact distribution 

 of the color markings. 



As a matter of course, when the seeds are the 

 product of cross-pollenizing, the offspring, rep- 



