1854. Introductory Essay, in Dr. Hooker’s Flora of New Zealand, vol. I. II. xvii. 241-252; 334-350.
1854. On the age of the large tree recently felled in California. II. xvii. 440-443.
1855. The Smithsonian Institution. II. xx. 1-21.
1856. Statistics of the Flora of the Northern United States. II. xxii., 204-232; xxiii. 62-84; 369-403.
1856. De Candolle’s Géographie Botanique Raisonnée. II. xxii. 429.
1859. Obituary Notice of Brown and Humboldt. II. xxviii. 161-165.
1860. Review of Darwin’s Theory on the Origin of Species by means of Natural Selection. II. xxix. 153-184; Darwiniana, pp. 9-61.
1860. Design versus Necessity. II. xxx. 226-239; Darwiniana, pp. 62-86.
1862. Enumeration of Rocky Mountain Plants. II. xxxiii. 237-243; 404-411; II. xxxv. 249-253; 335-341.
1862. Hooker’s Outlines of the Distribution of Arctic Plants, etc. II. xxxiv. 144.