This was preceded by a sketch, entitled "On the Variation of Organic Beings in a State of Nature;" published in the Journal of the Linnæan Society, vol. iii. (Zoology), 1859, p. 46.
The Variation of Plants and Animals under Domestication. 2 vols. 1868.
The Descent of Man, and Selection in relation to Sex. 2 vols. 1871.
The Expression of the Emotions in Man and Animals. 1872.
ZOOLOGICAL WORKS.
The Zoology of the Voyage of H. M. S. Beagle, edited and superintended by C. Darwin, 1840; consisting of five parts.
A Monograph of the Cirripedia, Part 1, Lepadidæ; Ray Society, 1851, pp. 400.
A Monograph of the Cirripedia, Part 2, the Balanidæ; Ray Society, 1854, pp. 684.
A Monograph of the Fossil Lepadidæ; Pal. Society, 1851, pp. 86.
A Monograph of the Fossil Balanidæ and Verrucidæ; Pal. Society, 1854, pp. 44.
Observations on the Structure of the Genus Sagitta; Annals of Natural History, vol. xiii., 1844.
Brief Descriptions of Several Terrestrial Phanariæ, and of Some Marine Species; Annals of Natural History, vol. xiv., 1844, p. 241.
BOTANICAL WORKS.
On the Various Contrivances by which British and Foreign Orchids are fertilized, 1862.
On the Movements and Habits of Climbing Plants; Journal Linnæan Society, vol. ix., 1865 (Botany), p. 1.—This paper has also been published as a separate work.
On the Action of Sea-water on the Germination of Seeds; Journal Linnæan Society, vol. i., 1857 (Botany), p. 130.
On the Agency of Bees in the Fertilization of Papilionaceous Flowers; Annals Natural History, vol. ii., 1858, p. 459.
On the Two Forms or Dimorphic Condition of the Species of Primula; Journal Linnæan Society, vol. vi., 1862 (Botany), p. 77.
On the Existence of Two Forms and their Reciprocal Sexual Relations in the Genus Linum; Journal Linnæan Society, vol. vii., 1863 (Botany), p. 69.
On the Sexual Relations of the Three Forms of Lythrum; Journal Linnæan Society, vol. viii., 1864, p. 169.
On the Character and Hybrid-like Nature of the Illegitimate Offspring of Dimorphic and Trimorphic Plants; Journal Linnæan Society, vol. x., 1867 (Botany), p. 393.
On the Specific Difference between Primula veris and P. vulgaris,
