From T. M. Reade   21 November 1874

My dear Sir—

I send you a copy of my paper on “Tidal Action as a Geological Cause”—in fact a cause that has been rather overlooked—¹

I am sorry to say I have not yet had the time to examine the list of Mollusca of the South American shores you were kind enough to inform me of some time since & I have not acknowledged your letter but do so now with thanks—² I shall make use of your information at some early period I hope if my profession will let me—³

I remain Dear Sir | Yours faithfully | T. Mellard Reade

Chas. Darwin E. FRS &c