Views of nature: or Contemplations on the sublime phenomena of creation / with scientific illustrations

by Alexander von Humboldt

[OT]. Wislizenus, Tour to Northern Mexico, 1848, p. 97.

[OU]. See p. 15.

[OV]. Hooker, Flora antarctica, p. 69.

[OW]. Compare the section Orchideæ in my work, De distrib. geogr. Plant., pp. 241–247.

[OX]. See Darwin, Journal of Researches, p. 449.

[OY]. See his Abhandl. der Wiss. zu München, bd. iii. 1837–1843, S. 752.

[OZ]. Synopsis Coniferarum, 1847.

[PA]. See Cosmos, vol. i. pp. 282–287 (Bohn’s edition).

[PB]. See my Examen crit., t. ii. pp. 246–259.

[PC]. Flora Antarctica, p. 229.