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 PrimulaceaB 

 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 vrith 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. 



Mimulcs LUTEUS the intercrossed plants are de- 

 rived from a cross between two plants of the 

 8th self-fertilised generation. The self-fertilised 

 plants belong to the 9th generation .... 



EschsciiOLTZIA CAI.ifornica the intercrossed andj 

 self-fertilised plants belong to the 2nd generation/ 



DlANTHUSCARYOPHYLLUS the intercrossed plants' 

 are derived from self-fertilised of the 3rd ge- 

 neration, crossed by intercrossed plants of the 

 3rd generation. The self-fertilised plants belong 

 to the 4th generation , 



PETUHIA. VIOLACEA the intercrossed and self-fer-1 

 tili.-jd plants belong to the 5th generation . ,J 





"O^ 



293 

 a 2, a 



1 ~i 



100 



100 



100 



100 



45 



45 



54 



40 



33 



46 



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



deiwed 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. 



