It may seem superfluous to describe any part of such a well-known district as the Isle of Wight; but although its geology has been so well investigated, still the Post-Pliocene deposits of the island have perhaps received less attention than any others. The origin of its valleys, moreover, has not, so far as I am aware, been carefully studied; and as it may throw light on the date of formation of the Solent and Spithead, I venture to send a few notes made on a recent examination of the valley of the Yar, in the hope they may prove interesting, even if not original.