7998 REV. GEORGE HENSLOW ON THE 
Darwin of such a correlation. Thus pale-flowering Pelargonia, such as,“ Christine," — 
according to Mr. J. Denny, are “ great seeders.” That observer remarks (as quoted by ` 
Mr. Darwin, l. c. p. 142, from the * Florist and Pomologist, Jan. 1872, p. 11) :— 
* There are some varieties, especially those with petals of a pink colour, or which possess a weakly ] 
constitution, where the pistil [stigmas] expands as soon as or even before the pollen-bag bursts, and in — 
which also the pistil is frequently short, so when it expands it is smothered, as it were, by the bursting 1 
anthers ; these varieties are great seeders, each pip being fertilized by its own pollen." (Tab. XLIV. fig.12.) - 
That albinism is due to want of energy is corroborated by some experiments of 1 
Mr. B. T. Lowne, who found that garden Balsams became white if ammonia be with- — 
held from the soil, but if they were manured with it the colour returned. | 1 
Another instance of a usually strongly proterandrous flower becoming self-fertile by — 
losing its dichogamy is Dianthus caryophyllus. Mr. Darwin cultivated a dark crimson — 
variety, which became highly self-fertile in the third generation :—‘ The proportional - 
number of seeds per capsule produced by the plants of crossed origin to those produced ^ 
by the plants of self-fertilized origin (both lots being spontaneously self-fertilized) was as ] 
100 to 125.” On p. 309 we learn that ** the self-fertilized plants of the third generation 1 
all bore flowers of exactly the same pale rose-colour ;" and Mr. Darwin thinks that “it | 
is not improbable that some of the parent plants which were first self-fertilised may have — 
borne flowers thus coloured.” If, as is also probable, others were of the crimson kind, 3 
then such must have acquired the paler tint. E 
Of Antirrhinum majus, the relative self-fertility of the red and white varieties is ` 
as 98:20. Of Lobelia ramosa, while the coloured variety was quite sterile, Mr. Darwin 4 
found the white or **snow-flake " form partly self-fertile, and produced when protected 3 
about one third as many seeds as when uncovered. Mimulus luteus produced under cul- 3 
tivation a highly self-fertile white or nearly white variety. Its fertility, as compared | 
with that of intercrossed plants, which are yellow, was as 147: 100 (l.c. p. 348). Ker- - 
bascum Lychnitis is highly self-fertile, and has a very pale-coloured corolla, as well as — 
white hairs on the filaments ; but V. nigrum is bright yellow with purple filaments, and 1 
is self-sterile. Lastly, the Petunia "violacea cultivated by Mr. Darwin was of a dingy | 
purple, but the self-fertilized plants assumed a flesh-colour. E 
While writing I have before me a blossom from a variety of the crimson Chinese Pring 1 
rose. The colour is approximating a brick-red, The greenish spot at the base of each petal ` 
is not well defined as in the purer breeds, but extends upwards with an indented outline - 
spreading over the lower third part of the petal. There is also a minute white speck at ` 
the base of each incision of the margin. It belongs to the short-stamened form, as they ` 
are situated halfway down the tube; but the pistil is entirely below them. It seeds very 1 
freely. The foliage and petals are somewhat smaller than in the normal forms. P 
A white variety of Polygala vulgaris. This I found to be self-fertilizing, as will be 1 
described hereafter. (Tab. XLIV, figs. 7 a, b.) | 
Pinguicula. The larger species, with dark purple blossoms, are adapted for inter- 1 
crossing; but P. lusitanica, which is pale lilac or white, is self-fertilizing. pans XLIV 
figs. 34 a, b, c.) 
Lysimachia vulgaris. Dr. H. Müller Fecords the fact that, the self-fertilizing form of 1 
