volume 2 page 415.)

CONCEPCION.

I cannot add anything to the excellent account by Captain Fitzroy of the
elevation of the land at this place, which accompanied the earthquake of
1835. (Ibid volume 2 page 412 et seq. In volume 5 page 601 of the
"Geological Transactions" I have given an account of the remarkable
volcanic phenomena, which accompanied this earthquake. These phenomena
appear to me to prove that the action, by which large tracts of land are
uplifted, and by which volcanic eruptions are produced, is in every respect
identical.) I will only recall to the recollection of geologists, that the
southern end of the island of St. Mary was uplifted eight feet, the central
part nine, and the northern end ten feet; and the whole island more than
the surrounding districts. Great beds of mussels, patellae, and chitons
still adhering to the rocks were upraised above high-water mark; and some
acres of a rocky flat, which was formerly always covered by the sea, was
left standing dry, and exhaled an offensive smell, from the many attached
and putrefying shells. It appears from the researches of Captain Fitzroy
that both the island of St. Mary and Concepcion (which was uplifted only
four or five feet) in the course of some weeks subsided, and lost part of
their first elevation. I will only add as a lesson of caution, that round
the sandy shores of the great Bay of Concepcion, it was most difficult,
owing to the obliterating effects of the great accompanying wave, to
recognise any distinct evidence of this considerable upheaval; one spot
must be excepted, where there was a detached rock which before the
earthquake had always been covered by the sea, but afterwards was left
uncovered.

On the island of Quiriquina (in the Bay of Concepcion), I found, at an