I. Historical Summary. Easily accessible, situated in a charmingly picturesque country, and marking some of the most interesting phases in the evolubion of the British Is]es, the Malvern Hills have now for nearly 80 years formed the subject of geological investigations, and have ever yielded new facts of interest and importance. Leonard Horner described the Malverns as a granitic mass intruded into the associated strata. Murehison 2 regarded the chain as essentially of igneous origin, though including ‘Silurian’ beds altered by the intrusion. Phillips, in his masterly work on the district, maintained that the Lower Palmozoie strata associated with the range had been deposited against the crystalline rocks. Ho11, regarding the range as probably composed of pre-Cambrian metamorphosed sedimentary and igneous rocks, described the Cambrian aud Silurian beds as overlapping the metamorphic series. Mr. Rutley considers that the gneissic and schistose rocks of the Malverns are a series of altered tufts, grits, sandstmnes, and volcanic and other igneous rocks. Dr. Callaway, on the other hand, regards the former series as metamorphosed plutonic rocks, chiefly granite and diorite, and compares them with the Archamn Series of Primrose Hill in Shropshire. The same author` recognized the volcanic series of the Herefordshire Beacon, and correlated it with the Urieonian rocks of Lilleshall Hill in Shropshire. The Herefordshire Beacon rocks have subsequently been studied by Green, and by Messrs. Rutley, Harker, and Acland. During the past year the present writer has maintained that the Malvern and Abberley Hills are the basal wrecks of an