Chap. I. 



PRIMULA VBRIS. 



27 



capsules, whether good or bad, from the legitimately 

 and illegitimately fertilised flowers, we find that the 

 former contained seeds by weight compared with the 

 latter as 50 to 24, or as 100 to 48; but if all the poor 

 capsules are rejected, of which many were produced 

 by the illegitimately fertilised flowers, the propor- 

 tion is 54 to 35, or as 100 to 65. In this and all other 

 cases, the relative fertility of the two kinds of union 



Fig. 2. 



Legitimate union. 

 Complete fertility. 



Legitimate union. 

 Complete fertility. 



1 Illegitimate 

 t union, 

 j Incomplete 

 / fertility. 



can, I think, be judged of more truly by the average 

 number of seeds per capsule than by the proportion of 

 flowers which yield capsules. The two methods might 

 have been combined by giving the average number of 

 seeds produced by all the flowers which were fertilised, 

 whether they yielded capsules or not; but I have 

 thought that it would be more instructive always to 

 show separately the proportion of flowers which pro- 



