92 MR. J. SCOTT ON THE FUNCTIONS AND STRUCTURE OF THE 
mutual sexual relations existing between it and the latter are taken 
into consideration. For the sake of illustrating these important 
points we will enter into a few comparative details. First, then, 
if we compare the results given in Table II. from the equal-stamened 
and -styled form when self-fertilized, with the most fertile of the 
homomorphic unions given in Table I., we see that the former pro- 
duces more seed than the latter, the proportions being fully as two 
to one. Secondly, the results in Table IL, from the short-styled 
form by the application of pollen from the form with stamens and 
styles of an equal length, afford an average of eight seeds per 
capsule, which is six seeds per capsule below the average homo- 
morphic union of this form. Again, from the union of the long- 
styled form with the equal-stamened and -styled form, the average 
is reduced to five seeds per capsule, which is seven below the 
average produce of this form’s homomorphic union. The lowest 
average of seeds is thus seen to be produced by the union of the 
equal-stamened and -styled with the long-styled form. This result 
I had partly anticipated from observations on the pollen-grains of 
the equal-stamened and -styled form, as I found that they agreed 
very closely with those characteristic of the long-styled form, and 
decidedly less than those of the short-styled form. From these 
results and observations, then, we may justifiably conclude, as 
Mr. Darwin has done from observations on a similar form (loc. eit. 
p. 80), that the equality in the length of the stamens and pistils 
was due to an abnormal development of the stamens, as shown by 
the relatively small grains of pollen they produced. We are thus 
afforded a tolerably satisfactory explanation for the decreased fer- 
tility remarked upon above, between the unions of this form and 
the long- and short-styled forms, in comparison with the homo- 
morphic unions of the latter. There is yet, however, a most in- 
teresting fact, for which I can offer no explanation, namely, the 
high relative fertility of the equal-stamened and -styled form when 
fertilized with own pollen. We have seen that this form differs 
structurally from the long-styled form only in the place of attach- 
ment of the anthers, agreeing with it in the more important cha 
racteristics of the size of pollen-grains and stigma: physiologi- 
cally, however, there is a marked divergence—an important fanc- 
tional adaptation in the relation of its own pollen to its ow? 
stigma. 
No one has hitherto tested the influence of dimorphism On 
` hybridism ; and now, having done with the individual and recipro- 
eal relations of the sexual powers in the different forms of Pri- 
