could not have placed nearly sufficient pollen on the stigmas, as the
spontaneously self-fertilised capsules contained much fewer seeds, on an
average, than those (as may be seen in Table 1.9.) which were artificially
fertilised with their own-form pollen. But this difference may perhaps be
attributed in part to the flowers in the table having been fertilised with
pollen from a distinct plant belonging to the same form; whilst those which were
spontaneously self-fertilised no doubt generally received their own pollen. In a
future part of this volume some observations will be given on the fertility of a
red-coloured variety of the primrose.

Primula Sinensis.

In the long-styled form the pistil is about twice as long as that of the short-
styled, and the stamens differ in a corresponding, but reversed, manner. The
stigma is considerably more elongated and rougher than that of the short-styled,
which is smooth and almost spherical, being somewhat depressed on the summit;
but the stigma varies much in all its characters, the result, probably, of
cultivation. The pollen-grains of the short-styled form, according to
Hildebrand, are 7 divisions of the micrometer in length and 5 in breadth;
whereas those of the long-styled are only 4 in length and 3 in breadth. (1/10.
After the appearance of my paper this author published some excellent
observations on the present species 'Botanische Zeitung' January 1, 1864, and he
shows that I erred greatly about the size of the pollen-grains in the two forms.
I suppose that by mistake I measured twice over pollen-grains from the same
form.) The grains, therefore, of the short-styled are to those of the long-
styled in length as 100 to 57. Hildebrand also remarked, as I had done in the
case of P. veris, that the smaller grains from the long-styled are much more
transparent than the larger ones from the short-styled form. We shall hereafter
see that this cultivated plant varies much in its dimorphic condition and is
often equal-styled. Some individuals may be said to be sub-heterostyled; thus in