ht,' 1820, p.
38.

[224] 'Gardener's Chronicle,' 1858, p. 771.

[225] 'Bastarderzeugung,' s. 87, 169. _See_ also the Table at the end of
volume.

[226] 'Bastarderzeugung,' s. 87, 577.

[227] 'Kenntniss der Befruchtung,' s. 137; 'Bastarderzeugung,' s. 92, 181.
On raising the two varieties from seed _see_ s. 307.

[228] 'Bastarderzeugung,' s. 216.

[229] The following facts, given by Koelreuter in his 'Dritte Fortsetzung,'
s. 34, 39, appear at first sight strongly to confirm Mr. Scott's and
Gaertner's statements; and to a certain limited extent they do so.
Koelreuter asserts, from innumerable observations, that insects incessantly
carry pollen from one species and variety of Verbascum to another; and I
can confirm this assertion; yet he found that the white and yellow
varieties of _Verbascum lychnitis_ often grew wild mingled together:
moreover, he cultivated these two varieties in considerable numbers during
four years in his garden, and they kept true by seed; but when he crossed
them, they produced flowers of an intermediate tint. Hence it might have
thought that both varieties must have a stronger elective affinity for the
pollen of their own variety than for that of the other; this elective
affinity, I may add, of each species for its own pollen (Koelreuter,
'Dritte Forts.,' s. 39, and Gaertner, 'Bastarderz.,' _passim_) being a
perfectly well-ascertained power. But the force of the foregoing facts is
much lessened by Gaertner's numerous experiments, for, differently from
Koelreuter, he never once got ('Bastarderz.,' s. 307) an intermediate tint
when he crossed the yellow and white flowered varieties of Verbascum. So
that the fact of the white and yellow varieties keeping true to their
colour by seed does not prove that they were not mutually fertilised by the
pollen carried by insects from one to the other.

[230] 'Amaryllidaceae,' 1837, p. 366. Gaertner has made a similar
observation.

[231] Koelreuter first observed this fact. 'Mem. de l'Acad. St.
Petersburg,' vol. iii. p. 197. _See_ also C. K. Sprengel, 'Das Entdeckte
Geheimniss,' s. 345.

[232] Namely, Barbarines, Pastissons, Giraumous: 'Annal. des Sc. Nat.,'
tom. xxx., 1833, pp. 398 and 405.

[233] 'Memoire sur les Cucurbitaceae,' 1826, pp. 46, 55.

[234] 'Annales des Se. Nat.,' 4th series, tom. vi. M. Naudin considers
these forms as undoubtedly varieties of _Cucurbita pepo_.

[235] 'Mem. Cucurb.,' p. 8.

[236] 'Zweite Forts.,' s. 53, namely, Ni