Chaf. IX. AND SELF-FERTILISED PLANTS. 317 



Table D continual. 



Pktuxia violacea left uncovered as above: offspring of 

 plants self-fertilised for four generations and then crossed 

 by a fresh stock, compared with plants of the 5th self- 

 fertilised generation, produced seeds, as judged by the 

 weight of an equal number of capsules 



Cvclamen persicum crossed and self-fertilised plants, left") 

 uncovered in the greenhouse, produced capsules in number/ 



Anagallis collina crossed and self-fertilised plants, lefti 

 uncovered in the greenhouse, produced capsules in number/ 



Primula veris left uncovered in open ground and cross- 

 fertilised by insects : offspring from plants of the 3rd 

 illegitimate generation crossed by a fresh stock, compared 

 with plants of the 4th illegitimate and self-fertilised 

 generation, produced capsules in number 



Same plants in the following year 



Primula veris (equal-styled variety): left uncovered in") 

 open ground and cross-fertilised by insects: offspring] 

 from plants self-fertilised for two generations and tliL-ni- 

 crossed by another variety, compared with plants of the 3rd 

 self-fertilised generation, produced capsules in number J 



Primula veris (equal-styled var.) same plants; average \ 

 number of seeds per capsule / 



Trimula veris (equal-styled var.) productiveness of the) 

 same plants, as judged by number of capsules produced > 

 and average number of seeds per capsule I 



as 100 to 46 



12 



O'O 



15 



11 



This table includes thirty-three cases relating to 

 twenty-three species, and shows the degree of innate 

 fertility of plants of crossed parentage in comparison 

 with those of self-fertilised parentage ; both lots being 

 fertilised in the same manner. With several of the 

 species, as with Eschscholtzia, Eesecla, Viola, Dian- 

 thus, Petunia, and Primula, both lots were certainly 

 cross-fertilised by insects, and so it probably was with 

 several of the others ; but in some of the species, as 

 with Nemophila, and in some of the trials with Ipomcea 

 and Dianthus, the plants were covered up, and both 

 luts were spontaneously self-fertilised. This also was 

 necessarily the case with the capsules produced by the 

 cleistogamic flowers of Vandellia. 



