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.
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.
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,