XV. Geological observations, in correction of and addition to the paper on the great Derbyshire Denudation, in our last, and the report on Derbyshire, c.; relating principally to Coal-measures near to the chalk strata; the course of the 3d and 4th Grit Rocks and Crowstone through Yorkshire, and the termination of its Coal-field northward: the limits of the Yellow Lime Rock, and the existence of Red Marl, Gypsum beds, Strontian, c. between its Rocks, c. c.