[NF]. Robert Brown, General remarks on the botany of Terra Australis, in Flinders’ Voyage, vol. ii. p. 338.
[NG]. Compare my essay, De distributione geographica Plantarum secundum cœli temperiem et altitudinem montium, 1817, pp. 24–44; and see the farther development of numerical relations as given by me in the Dictionnaire des Sciences naturelles, t. xviii. 1820, pp. 422–436; and in the Annales de Chimie et de Physique, t. xvi. 1821, pp. 267–292.
[NH]. Humboldt et Bonpland, Plantes équinoxiales, t. i. p. 33, tab. 10.
[NI]. See his work, Regni Vegetabilis Systema naturale, t. i. pp. 128, 396, 439, 464, 510.
[NJ]. Biologie, bd. ii. s. 47, 63, 83, 129.
[NK]. Decandolle, Théorie élémentaire de la Botanique, p. 190; Humboldt, Nova genera et species Plantarum, t. i. pp. xvii. 1.
[NL]. Jahrbücher der Gewächskunde, bd. i. Berlin, 1818, s. 18, 21, 30.
[NM]. Playfair, in the Transactions of the Royal Soc. of Edinb., vol. v. 1805, p. 202; Humboldt, on the sum total of the thermometric degrees required for the cycle of vegetation of the Cereals, in Mém. sur des lignes isothermes, p. 96; Boussingault, Economie rurale, t. ii. p. 659, 663, 667; and Alphonse Decandolle, Sur les causes qui limitent les espèces végétales, 1847, p. 8.
[NN]. Introduction to Botany, 2nd ed. p. 504.
[NO]. Manuscript notice communicated to the “Gartenbau-Verein” in Dec. 1846.