with the hypothesis of the submersion of 1,200 miles of land once
intervening. I want naturalists carefully to examine floating seaweed
and pumice met with at sea. Tell your correspondents to look out. There
should be a microscopic examination of both these means of
transport.--Believe me ever truly yours,

CHA. LYELL.

* * * * *

SIR C. LYELL TO A.R. WALLACE


_73 Harley Street. July 3, 1867._

My dear Mr. Wallace,--I was very glad, though I take in the _Westminster
Review_, to have a duplicate of your most entertaining and instructive
essay on Mimicry of Colours, etc., which I have been reading with great
delight, and I may say that both copies are in full use here. I think it
is admirably written and most persuasive.--Believe me ever most truly
yours,

CHA. LYELL.

* * * * *

TO HERBERT SPENCER


_Hurstpierpoint, Sussex. October 26, 1867._