46 HETEROSTYLED DIMORPHIC PLANTS. Chap. I. 



possible, in all the previous eases, by the manner in 

 which the calculations have been made. Supposing, 

 for instance, that 20 flowers were fertilised legiti- 

 mately and yielded 18 capsules, and that 30 flowers 

 were fertilised illegitimately and yielded 15 cap- 

 sules, we may assume that on an average an equal 



Table 12. 



Summary on the Fertility of the two Legitimate Unions, 

 compared with that of the two Illegitimate Unions, 

 in the genus Primula. The former taken at 100. 



Name of Species. 



Illegitimate Unions. 



Primula veris 



P. elatior 



Judged of by the 



Proportional Number 



of Flowers -which 



produced Capsules. 



P. vulgaris 

 P. Sinensis 



(second trial) 

 (after Hildebrand) 



P. auricula (Scott) .... 



P. Sikkimensis (Scott) . . 



P. cortusoides (Scott) . . 



P. involucrata (Scott) . . 



P. farinosa (Scott) . . . 



Average of the nine species 



69 

 27 



88.4 



Judged of by the Average 



Number (or Weight in 



some cases) of Seeds 



per Capsule. 



65 

 75 



60 



54 



84 



63 



? 



53 



10 



42 



80 



15 



95 



31 



74 



66 



72 



48 



71 



44 



(Probably 

 too high. ) 

 (Probably 

 too low. ) 



61.8 



proportion of the flowers in both lots would fail to 

 produce capsules from various accidental causes; and 

 the ratio of fg- to ■£-&, or as 100 to 56 (in whole 

 numbers), would show the proportional number of cap- 

 sules due to the two methods of fertilisation; and the 

 number 56 would appear in the left-hand column 



