572 Reports and Proceedings—Geological Society of London. 
the Sinai Peninsula is also coloured geologically. Notes of mines 
and quarries are printed on the map, and the ‘“‘ Gravel Ridges of 
Quartz and Chert Pebbles with Silicified Trees” are indicated in the 
Oligocene tract west of Cairo. The famous ‘‘ Petrified Forest” that 
occurs to the east-south-east of Cairo occupies a comparatively 
small area and is not marked. Some account of it was given by 
Mr. Carruthers in the Grorocicat Macazine for July, 1870 (p. 306). 
Another geological map of Egypt, in one sheet, scale 1 : 2,000,000, 
has'also been published by the Survey Department. 
2. Oxrorp Watt Maps.—A series of wall-maps designed to assist 
teachers of Geography is in course of preparation and publication at 
the Clarendon Press, Oxford, under the editorship of Professor A. J. 
Herbertson. The maps are not simply reproductions of existing 
works, but have been specially prepared with the aid of experts, and 
drawn by Mr. B. V. Darbishire, M.A. Most of the maps are to be 
printed without names of places, etc., as these obscure the main 
features. Such is the case with the specimen before us, ‘‘ The British 
Isles, Geology.” The scale is 1 : 1,000,000 or about 16 miles to 
1 inch. Squares printed in black, alongside the scale, show 
respectively areas of 250 square miles and 100 square kilometres. 
The geological groups that are indicated by colour on the map are 
Igneous, Archzan, Cambro-Silurian, Devonian—Carboniferous, Permo- 
Triassic, Jurassic, Cretaceous, and Tertiary. Coal-measures are 
printed in black, and the other Carboniferous strata are distinguished 
from Devonian by cross-ruling. Magnesian Limestone, Oolite Lime- 
stone, and Chalk are indicated in a general way by cross-ruling. The 
colour-printing is clear, and although there are some slight differences 
in shade between the northern and southern halves of the map (which 
have been separately printed), they are hardly noticeable at a distance. 
The map, which includes the adjacent portions of France and the 
Channel Islands, should be a very useful diagram to a teacher versed 
in geology, especially if provided also with a map of the physical 
features and a series of geological sections. The price of the 
geological map is 7s. unmounted, 8s. 6d. mounted on cloth to fold, 
and 10s. 6d. on rollers. 
RmEPOnRLTS AIND LROCHA DINGS: 
Grotogicat Socitety or Lonpon. 
November 9, 1910.—Professor W. W. Watts, Sc.D., M.Sc., F.B.S., 
President, in the Chair. 
The following communications were read :— 
1. ‘‘ The Rhetic and Contiguous Deposits of West, Mid, and Part 
of East Somerset.’? By Linsdall Richardson, F.R.S.K., F.L.S., F.G.S. 
This paper contains a detailed account of the Rhetic strata of 
Somerset, with the exception of a small area bordering upon Bristol. 
The magnificent sections at Blue Anchor and Lilstock are described 
in detail, and correlated with those on the opposite Glamorgan coast. 
The record by Professor Boyd Dawkins of characteristic Rheetic 
mollusca in the top portion (uppermost 14 feet or so) of the Grey 
Marls is confirmed, and the contention for their recognition as Rheetic 
