Reviews—Lorraine and Saar Minefields. 83 
They do not profess to be complete monographs, but rather 
synopses of the information available for the period under review. 
The information given is largely statistical, but useful sections are 
included indicating the mode of occurrence and principal industrial 
applications of each mineral, together with in each case a 
bibliography of recent technical publications bearing on the subject : 
this is an excellent feature. The particulars given appear to be very 
accurate and up-to-date, and these small handbooks will be of great 
value to all concerned in the various industries. We shall anticipate 
the appearance of the complete volume with much interest. It is 
stated in the prefaces that in future great use will be made of graphic 
representation of statistics. We are inclined to regret this, as in our 
opinion such graphs have been overdone of late years. They take 
up a lot of room, and may be misleading unless all are on the same 
scale and refer to the same units, which is usually impossible. 
LoRRAINE AND Saar Minerietps. Handbooks of the Historical 
Section, Foreign Office, No. 31. 30 pp. 1920. Price 1s. net. 
(pees small pamphlet, one of a series prepared by the Foreign 
Office for the information of delegates to the Peace Conference, 
contains an excellent summary of the geography, geology, production, 
and reserves of the iron-mining district of Lorraine and Luxemburg’ 
and of the coalfield of the Sarre. The enormous importance of the 
minette of Lorraine as a factor in the iron and steel trade of Europe 
is well brought out, and the political aspect of the matter is clearly 
explained, as it stood before the terms of peace were settled. The 
somewhat inferior character of the Sarre coals, and their 
unsuitability for metallurgical coke, are rightly insisted on, and the 
difficulty of obtaining an adequate supply of coal and coke for 
France is discussed ; it is suggested that the best solution is to be 
found in an extension of the canal system and improvement of 
existing waterways. 
A TrextTsBook oF Grorocy. By Puiie Laxs, M.A., F.G.S., and 
R. H. Rastatt, M.A., F.G.8. pp. xiv and 508. Third edition. 
1920. 
iN COPY of the above textbook is recognized as part of the present- 
day equipment of every geological student, and its value and 
popularity are both proved by the welcome appearance of a revised 
third edition, that treads closely upon the heels of a second impression 
of the previous issue, reviewed in the February number of the 
GroLocicaL MaGazine for 1911. 
Whilst retaining in the main the well-arranged form and contents 
of the earlier editions, the present book has been thoroughly revised 
and enlarged. The section on coral reefs has been enriched by 
notes on the results of investigations of American geologists such 
