112 MR. J. SCOTT ON THE FUNCTIONS AND STRUCTURE OF THE 
pollen-grains of the short-styled plants are larger, less transparent, 
and more bluntly triangular than those from the long-styled 
plants. 
In the following table I have given the results of my experiments 
on this species :— 
TABLE IX.— Primula cortusoides. 
Saal Eag 8 4 
2d 29 Hm Si omn 
HEERETEHIEEFBERGT 
cSe | Es | 253 | b28 
CHEMIE 
čo 
Long-styled homomorphie union...... 10 2 287 41 
Long-styled heteromorphie union . 8 6 343 51 
Short-styled homomorphie union ...| 10 6 228 38 
Short-styled heteromorphie union ... 8 8 487 61 
SUMMARY. 
The two homomorphic unions......... 20 13 515 39 
The two heteromorphie unions ...... 16 14 830 59 
I tried repeatedly to reciprocally hybridize the two forms of 
P. cortusoides with those of P. Sinensis, but though I was led to 
anticipate favourable results from the swelling of several of the 
capsules, I was ultimately disappointed, as they did not contain 4 
single good seed. Y was more successful, however, in a similar 
series of experiments with the P. cortusoides and P. mollis; the 
latter, as I have previously stated, is characterized by an equality 
in the length of the stamens and styles. The results are given in 
the table beneath. If we compare the results with the pure 
unions of P. cortusoides in Table IX., and with those of P. mollis, 
we shall see that the fertility of both species is greatly decreased ; 
we shall also see that there is still no regularity as to the degree 
of fertility resulting from the converse unions. Thus, the pure 
long-styled homomorphic unions of P. cortusoides yield an average 
of forty-one seeds per capsule, while by its union with P. mollis 
—the latter being used as male—the average is reduced to five 
seeds per capsule—that is, as eight to one, The short-styled 
P. cortusoides by pollen of P. mollis did not yield a single seed, 
though several of the capsules swelled. Higher grades of fertility 
are seen to result from P. mollis as female. Thus, by pollen of 
the long-styled P. cortusoides it yields an average of fifty-one seeds 
per capsule; by pollen of the short-styled P. cortusoides the results 
are sixty-seven seeds per capsule. Now, from the pure unions of 
