566 Revieivs — Excursions round London. 



quartz. Titanium, and to a less extent phosphorus, are remarkably 

 abundant, and this feature becomes especially noteworthy in the 

 basalts. It seems to be possible to correlate the presence of cossyrite 

 with the high content of titanium, and the absence of riebeckite with 

 the absence of fluorine and the low proportion of zirconium. 



Akthur Holmes. 



XIV. — GrEOIOGICAL ExCUESIONS ROUND LoNDON. By GeOEGE MacDoNALD 



Davies, B.Sc, F.G.S. pp. 156, with maps, sections, and 

 photographs. Thomas Murby & Co., 1914. Price 3s. 6<f. net. 



THIS is a useful little handbook and guide to the geology of some 

 of the most interesting localities in the neighbourhood of 

 London. The book is intended primarily for the use of students who 

 require to gain some knowledge of field geology and who should be 

 able to learn a great deal by following out these carefully planned 

 excursions. It will also, no doubt, appeal to the many who are 

 really interested in the geology of the London district, but are often 

 unable to find their way to important sections or instructive view-points. 



The first thirty-four pages are devoted to an outline of the 

 stratigraphical geology of the South-East of England, the arrange- 

 ment of which is clear and concise. 



Twenty-six excursions are planned, fifteen of which are arranged 

 as half-day excursions. Particulars of railway routes and fares are 

 given, and with the very full directions it should be possible to follow 

 out the itinerary without the aid of a map. Teachers should find 

 this book of value in conducting field classes. 



XV. — Brief Notices. 



1. Aegylishire and Buteshire. By Peter Macnair, F.G.S. 

 pp. X + 161. Cambridge University Press, 1914. Is. 6</. net. 



The excellence of the Cambridge County Geographies has now 

 been universally recognized, and in this member of the series, 

 one of the latest to be issued, the high standard is easily maintained. 

 The author has in Argyllshire a county which is extraordinarily 

 difficult to describe from the geological and structural point of view 

 in a space so short as that at his disposal. In Buteshire his task is 

 less formidable, but in both cases he has succeeded in writing an 

 admirable account of geological history, and of the surface features, 

 scenery, and economic conditions which are its natural outcome. The 

 book gives a well-balanced and thoroughly interesting account of two 

 fascinating counties which provide holiday centres that are not easily 

 surpassed. 



2. Notes on Radium-bearing Minerals. By "Wyatt Malcolm. 

 Prospector's Handbook No. 1. Issued by the Geological Survey 

 of Canada, 1914. pp. 26. 



In this handy little book the uranium minerals — pitchblende, 

 carnotite, autunite, and torbernite — and the modes of testing their 

 radio-activity by the electroscope, the scintilloscope, and their effect on 

 a photographic plate (the last, as the author warns, resulting also from 



