It appears that the principal object of M^r Williams’¹ paper is to support the conclusions already arrived at by Prof: Sedgwick and M^r Murchison.² The chief point of additional evidence is the discovery of numerous barnacles, beneath the sandstone strata, adhering to the ancient rocks, and elevated between five and ten feet above the living ones. M^r Williams adduces also, as a proof of disturbance the changed course of the Taw, as observed by tracing certain beds of gravel.

The most interesting part of the paper is the description of the subsided forest, near Watchet in North Somersetshire. This appears of more importance, than the case of Pembrokeshire, alluded to by Prof: S. and M^r. Murchison, because it is both nearer the described localities, and falls within the area, more particularly marked out as one of elevation.— These opposite movements³ are adduced as proofs, that we must look to changes of level, rather in the land, than in the water.—

I should, therefore on the above grounds, suggest that M^r Williams’ paper, in a shortened form, should be printed in the Transactions, immediately after that of Prof: Sedgwick & M^r Murchison.—⁴

C. Darwin March 27^th. | 1837.