Ii. p. 228) that
a rock uncovered only at spring-tides, which had been chiselled
smooth in November, on the following May, that is, within
six months afterwards, was thickly covered with Fucus digitatus
two feet, and F. esculentus six feet, in length.
[8] With regard to Tierra del Fuego, the results are deduced
from the observations of Capt. King (Geographical Journal,
1830), and those taken on board the Beagle. For the Falkland
Islands, I am indebted to Capt. Sulivan for the mean of the
mean temperature (reduced from careful observations at
midnight, 8 A.M., noon, and 8 P.M.) of the three hottest
months, viz., December, January, and February. The temperature
of Dublin is taken from Barton.
[9] Agueros, Descrip. Hist. de la Prov. de Chiloe, 1791, p. 94.
[10] See the German Translation of this Journal; and for the
other facts, Mr. Brown's Appendix to Flinders's Voyage.
[11] On the Cordillera of central Chile, I believe the
snow-line varies exceedingly in height in different summers.
I was assured that during one very dry and long summer, all
the snow disappeared from Aconcagua, although it attains the
prodigious height of 23,000 feet. It is probable that much
of the snow at these great heights is evaporated rather than
thawed.
[12] Miers's Chile, vol. i. p. 415. It is said that the
sugar-cane grew at Ingenio, lat. 32 to 33 degs., but not in
sufficient quantity to make the manufacture profitable.
