CHAP. IX. 



AND SELF-FERTILISED PLANTS. 



319 



in which the productiveness of the plants was ascer- 

 tained by the number of capsules produced by an 

 equal number of plants, together with the actual or 

 average number of seeds in each capsule. Of such 

 cases there are twelve in the table, and the mean of 

 their mean fertility is as 100 for the crossed plants, 

 to 59 for the self-fertilised plants. The Primulacese 

 seem eminently liable to suffer in fertility from self- 

 fertilisation. 



The following short table, E, includes four cases 

 which have already been partly given in the last table. 



TABLE E. Innate Fertility of Plants from a Cross with a fresh 

 Stock, compared with that of Intercrossed Plants of the same 

 Stock, and with that of Self-fertilised Plants, all of the corre- 

 sponding Generation ; all these sets being fertilised in the same 

 manner. Fertility judged of by the number or weight of seeds 

 produced by an equal number of Plants. 



N B. In the above cases, excepting in that of Eschscholtzia, the plants 

 derived from a cross with a fresh stock belong on the mother-side to the 

 same stock with the intercrossed and self-fertilised plants, and to the cor- 

 responding generation. 



