In this short paper, the author presented facts, from which he thought himself entitled to infer that the Silurian mountain tract of southern Scotland falls entirely into his views regarding ancient glacial operations in the country generally, as expounded in a paper read to the Royal Society of Edinburgh, in December 1852, and published in the Edinburgh New Philosophical Journal for April 1853. He showed that the compact boulder clay, which he regards as the detritus of the early and general glaciation of the country, exists in the valleys of this district, and in passes amongst the hills, up to those of Glenlude and Tweedshaws, which are respectively 1152 and 1352 feet above the mean level of the sea.