he found 467 of these flowers to be long-styled, 411 short-styled, and 16 equal-
styled. I have heard of no other instance with heterostyled plants of equal-
styled flowers appearing in a state of nature, though far from rare with plants
which have been long cultivated. It is still more remarkable that in eighteen
cases the same plant produced both long-styled and short-styled, or long-styled
and equal-styled flowers; and in two out of the eighteen cases, long-styled,
short-styled, and equal-styled flowers. The long-styled flowers greatly
preponderated on these eighteen plants,--61 consisting of this form, 15 of
equal-styled, and 9 of the short-styled form.

Primula vulgaris (var. acaulis, Linn.)
The primrose of English Writers.

(FIGURE 1.3. Outlines of pollen-grains of Primula vulgaris, distended with
water, much magnified and drawn under the camera lucida. The upper and smaller
grains from the long-styled form; the lower and larger grains from the short-
styled.)

Mr. J. Scott examined 100 plants growing near Edinburgh, and found 44 to be
long-styled, and 56 short-styled; and I took by chance 79 plants in Kent, of
which 39 were long-styled and 40 short-styled; so that the two lots together
consisted of 83 long-styled and 96 short-styled plants. In the long-styled form
the pistil is to that of the short-styled in length, from an average of five
measurements, as 100 to 51. The stigma in the long-styled form is conspicuously
more globose and much more papillose than in the short-styled, in which latter
it is depressed on the summit; it is equally broad in the two forms. In both it
stands nearly, but not exactly, on a level with the anthers of the opposite
form; for it was found, from an average of 15 measurements, that the distance
between the middle of the stigma and the middle of the anthers in the short-
styled form is to that in the long-styled as 100 to 93. The anthers do not