88 MR. C. DARWIN ON THE DIMORPHIC CONDITION 
Number of! Number | Weight of | x umber |Weight of 
flowers | ofgood seed in || of good seed in 
fertilized. | pods. grains. | pods. grains. 
. | 
The two homomorphic 100 | 63 295 | 100 40 
UNIONS .............ees | 
-The two heteromor- x | 
phic unions .......... } 100 7 48 | 100 64 
In the first part of the upper table, the number of flowers fer- 
tilized and the simple result is shown ; and at the right hand, for 
the sake of comparison, the calculated product of the weight of seed 
from 100 good pods of each of the four unions is given ; showing 
that in each case the heteromorphic union is more fertile than the 
homomorphie union. Beneath we have a simple summary of the 
two homomorphie and the two heteromorphie unions. And lastly, 
for the sake of comparison, a caleulation has been made from this 
summary ; first, assuming that 100 flowers of both kinds of unions 
were fertilized; and then to the right hand, assuming that 100 
good pods were produced from both unions. If we compare the 
result, we see that the flowers of the two heteromorphie unions 
produced a greater number of good pods, and a greater weight of 
seed, than the flowers of the two homomorphie unions ; and again 
(and this is the fairest element of comparison, for accidents are 
thus almost eliminated), that the good pods from the two hetero- 
morphie unions yielded more seed, in about the proportion of three 
to two, than those from the two homomorphie unions. The dif- 
ference in weight from 100 capsules of the two forms is 24 grains, 
and this is equal to at least 1200 seeds. 
Beneath we have Table II. of P. veris, or the Cowslip. The 
upper part i is exaetly the same as in the Table of P. Sinensis, and 
we see in each case that the heteromorphic is more fertile than 
the homomorphic union. The calculated results from the sum- 
mary of the two homomorphic and the two heteromorphic unions 
are more complex than with the last species, as I wished to show 
_ that, however we proceed, the general result is the same. We see 
that the assumed hundred flowers, heteromorphically fertilized by 
the pollen of the other forms, yielded more capsules, more good 
capsules, and a greater weight of seed ; but I rely little on this, as 
some whole umbels perished after being fertilized. The fairest 
element of comparison is to take the good capsules alone; and we 
here see that the 100 from the two heteromorphic unions yielded 
seed which in weight was as 54 to 35 from the 100 good capsules 
