[4] I must express my obligations to Mr. Keane, at whose house
I was staying on the Berquelo, and to Mr. Lumb at Buenos Ayres,
for without their assistance these valuable remains would never
have reached England.

[5] Lyell's Principles of Geology, vol. iii. p. 63.

[6] The flies which frequently accompany a ship for some days
on its passage from harbour to harbour, wandering from the
vessel, are soon lost, and all disappear.

[7] Mr. Blackwall, in his Researches in Zoology, has many
excellent observations on the habits of spiders.

[8] An abstract is given in No. IV. of the Magazine of Zoology
and Botany.

[9] I found here a species of cactus, described by Professor
Henslow, under the name of Opuntia Darwinii (Magazine of
Zoology and Botany, vol. i. p. 466), which was remarkable
for the irritability of the stamens, when I inserted either a
piece of stick or the end of my finger in the flower. The
segments of the perianth also closed on the pistil, but more
slowly than the stamens. Plants of this family, generally
considered as tropical, occur in North America (Lewis and
Clarke's Travels, p. 221), in the same high latitude as here,
namely, in both cases, in 47 degs.

[10] These insects were not uncommon beneath stones. I found