46 HETEROSTYLED DIMORPHIC PLANTS. CHAP. I. 



possible, in all the previous cases, 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. 



proportion of the flowers in both lots would fail to 

 produce capsules from various accidental causes; and 

 the ratio of %$ to fa 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 



