Reviews — Geological Survey of England and Wales. 271 



■Cornwall, Devon, and West Somerset, most carefully compiled by 

 Mr. Clement Eeid, F.K.S. Notwithstanding the fact that De la 

 Beche's " Report " was published in 1839, it was destitute of an 

 index. No less than 1,500 copies were issued, and the memoir 

 is now out of print. It has, however, become one of the classics 

 of geology, and being a permanent work of reference an index has 

 been a great desideratum, which is now supplied by Mr. Clement 

 Eeid, and should be bound up with every existing copy of this 

 valuable memoir. 



Copies of this Index may be obtained from any agent for the sale 

 of Ordnance Survey maps, or through any bookseller, from the 

 Ordnance Survey Office, Southampton. 



3.— The Geology of the Isle of Man. By G. W. Lampltjgh, F.CS. 

 With Petrological Notes, by Professor W. W. Watts, M.A., 

 F.G.S. 8vo ; pp. xiv and 620, with a geologically coloured 

 map. Printed for H.M. Stationery Office. (London : E. Stanford 

 (or of Messrs. Dulau & Co., 37, Soho Square, W.), 1903. Bound 

 in cloth, price 12s.) 



It is not often that one geological surveyor has the pleasure and 

 satisfaction of seeing his name recorded as having completed a 

 memoir entirely by himself. Prof. J. W. Judd had the honour, 

 when on the Survey many years ago, to survey a whole English 

 county, that of Rutland ; but Mr. Lamplugh has surveyed a whole 

 island; nay, more, for was not Man a kingdom in itself up to 1765, 

 when the heiress of the Duke of Athol ceded her rights as Lord of 

 Man to the Crown; but it still has its own Parliament (the House 

 of Keys). Rising in the middle of the Irish Sea (with a length of 

 34 miles and a breadth of from 10 to 12 miles), it has an area, 

 including ' the Calf ' off its south-western extremity, of 227 square 

 miles (145,325 acres), of which 170 square miles, or three-fourths 

 of the whole island, are occupied by slate and greywacke rocks, 

 probably of Upper Cambrian age, composing the hilly massif. 

 Strata of Lower Carboniferous age occur in a small basin of 7 or 8 

 square miles at a low elevation in the south of the island ; and a 

 narrow strip of red sandstone, probably belonging to the same 

 period, borders the coast for 2 miles about midway upon the western 

 side. The northern extremity consists of a low-lying tract of about 

 45 square miles, which is an addition made to the Island in Glacial 

 times by the deposition of great masses of glacial drift upon the 

 pre-Glacial sea-floor. Deep borings through this drift have recently 

 revealed a rock floor of Triassic, Permian, and Lower Carboniferous 

 strata at a considerable depth below sea-level. 



The following table of strata shows the divisions which have been 

 adopted for the one-inch map of the Geological Survey, published 

 in 1898. The more southerly portion of the northern drift plain 

 may possibly be underlain by rocks intermediate in age between the 

 Manx Slate Series (Qpper Cambrian ?), which bounds it on the 

 south, and the Lower Carboniferous strata, which have been proved 

 in the borings at its northern marerin. No divisions have been 



