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Rh 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,