REPRODUCTIVE ORGANS IN THE PRIMULACEA. 101 
TaBLe B.—Primula vulgaris and var. alba. 
LONG-STYLED HETEROMORPHIC UNIONS. 
P. vulgaris, var. alba, by own-form pollen ...| 100 | 80 | 1550} 100 | 1937 | 
P vulgaris, var. alba, by pollen of P. vulgaris| 100 | 75 |1400| 100 | 1866 | 
P. vulgaris by pollen of P. vulgaris, var. alba, 100 | 80 | 1500, 100 |1875 
| 
SHORT-STYLED HETEROMORPHIC UNIONS. | 
P. vulgaris, var. alba, by own-form pollen ...| 100 | 83 | 1709| 100 | 2060 
P. vulgaris, var. alba, by pollen of P. vulgaris 100 | 70 |1030| 100 |1471 
P. vulgaris by pollen of P. vulgaris, var. alba, 100 | 70 | 1160} 100 |1657 
In the comparative tabulation of the long-styled homomorphie 
unions (Table A.), I have assumed, in the first column, that 100 
flowers were fertilized, and in the two columns to the right of 
this, given the relatively inereased proportions of capsules and 
seeds ; again, the right-hand column gives the calculated results 
from an assumed 100 of good capsules. If we compare the results, 
we see, first, that the short-styled form of P. vulgaris, var. alba, 
yields more seed, in about the proportion of 13 to 11 seeds per 
capsule, than those of the long-styled form, while the long-styled 
P. vulgaris, var. rubra, again exceeds the former in about the pro- 
portion of 14 to 13 seeds per capsule. In the reciprocal homo- 
morphic unions of P. vulgaris and the variety alba we see some 
little discordance in the results: thus, the most productive union 
is the short-styled homomorphic union of P. vulgaris by pollen 
of P. vulgaris alba, whereas the least productive of the four is 
the converse union of these forms. Again, in the long-styled 
homomorphie unions most is yielded from the unions of P. vul- 
garis alba by pollen of P. vulgaris ; so that the most fertile of the 
long- and short-styled erosses are thus seen to result from converse 
unions, namely in the former case from P. vulgaris alba by pollen 
of P. vulgaris, in the latter from P. vulgaris by pollen of P. vul- 
garis alba! 
In the comparative tabulation of the long-styled heteromorphic 
unions (Table B.) a similar arrangement is observed to that in 
Table A. The calculated results of these unions also show that 
the short-styled form of P. vulgaris alba when fertilized by own 
pollen is the more fertile, exceeding the similar long-styled union 
in the proportion of 20 to 19 seeds per capsule: compared with the 
short-styled homomorphic the proportions are as 20 to 13 seeds per 
capsule, or as 4 to 3 in favour of the long-styled heteromorphic. 
This relative accordance of the degrees of fertility resulting from 
similar homomórphie and heteromorphie unions when these are 
