Nat. Hist.,' 1845, vol. xvi, p. 355.

[172] See also Lindley, 'Veg. Kingd.,' p. 109 et 116_a_, where the views
of Raspail, R. Brown, Mohl, Henslow, and others, are discussed.

[173] It has been observed that if a plant is supplied with copious
nourishment the flowering-period is delayed; but that moderate or even
scanty nourishment accelerates it. Goethe, 'Metam.,' Sec. 30. See also
Wolff, 'Theoria Generationis,' 1759; Linn. 'Prolepsis,' Secs. 3 and 10.

[174] Moquin-Tandon, p. 384; also Lindl., 'Elements of Botany,' p. 65,
fig. 130; "Theory of Horticulture," p. 86. 'Gard. Chron.,' 1851, p. 723;
Irmish, 'Flora,' 1858, p. 38, &c.

[175] Caspary, 'Bull. Soc. Bot. Fr.,' vol. vi, 1859, p. 235; also Payer,
ibid., vol. i, 1854. p. 283.

[176] Trecul, 'Ann. Sc. Nat.,' 2nd ser., vol. xx, p. 339.

[177] 'Bull. Soc. Bot. Fr.,' vol. vii, 1858, p. 331.

[178] 'Bull. Soc. Bot. Fr.,' vol. i. p. 306, vol. v, p. 115. 'Illustr.
Hortic.,' xii, 1865, Misc. 79. 'Rev. Horticole,' 1860 p. 204, et 1867 p.
43.

[179] 'Bull. Soc. Bot. Fr.,' 1858, p. 685.

[180] The structure of this flower is discussed at some length in a
paper by the author on axillary prolification. 'Trans. Linn. Soc.,' vol.
xxiii, p. 486, t. liv. fig. 3. See also 'Clos. Bull. Soc. Bot. Fr.,'
vol. v, 1855, p. 672. Seringe et Heyland, 'Bull. Bot.,' i, p. 8. 'Pallas
Enum. Plant. Hort. Demidoff,' append, c, ic.

[181] 'Adansonia,' i, 181.

[182] 'Adansonia.' vol. iii, p. 351, tab. xii.

[183] 'Elem. Terat. Veget.,' p, 218.

[184] Masters, 'Journ. Linn. Soc.,' vol. ix, 1866, p. 334.

[185] 'Trans. Linn. Soc.,' vol. xxiv, p. 143. tab. xxiv.

[186] 'Brit. Assoc. Report,' Dundee, 1867; and Seemann's 'Journal of
Botany,' 1867, p. 319, tab. lxxii, figs. B 1-9.

[187] Duval Jouve, 'Hist. Equiset. France.' 1864, p. 154.

[188] 'Flora,' t. xxiv, 1841, p. 340.

[189] Moore, 'Nature-Printed British Ferns,' 8vo edition, vol. ii. p.
135. tab. lxxxv, B, &c.

CHAPTER IV.

HETEROGAMY.

This term is here intended to apply to all those cases in which the
arrangement of the sexual organs is different from what it is
habitually. It is evident that in many instances there is no
malformation, no monstrosity, but rather a restoration of organs
habitually suppressed, a tendency towards structural completeness
rather than the reverse. It must be also understood that the following
remarks apply to structural points only, and are not intended to include
the question of f