File 1422. - Letter from Sir Charles Lyall,

Asking if he had noticed when in Egypt to what depth the Nile mud of former years became saturated by the annual inundations, so as to be able to tell him whether it was likely that they would be rendered yielding enough to allow bricks to sink down through them, which information was wanted to refute criticism of his views regarding the Nile in a passage in pp. 35-6 of his Antiquity of Man; wishes to answer this criticism in a new edition; encloses an old proof copy (1422a) of the passage in question.