432 Reviews—The Mineral Resources of Great Britain. 
SpeciaL Reports oN THE MINERAL RESOURCES OF GREAT Britain, 
Vol. XVIII: Rocx-saut anp Brine. By R. L. Suertocn. 
Mem. Geol. Survey, pp. vi +- 123, with 2 plates and 16 text- 
figures. 1921. Price 5s. net. 
ITHERTO it has been very difficult to obtain any information 
as to the salt deposits of Great Britain, and especially those not 
in Cheshire, but this difficulty is now removed. Out of the materials 
at his disposal Dr. Sherlock has constructed an extremely interesting 
memoir, well-written and well-arranged, and conveying just the 
kind of information must useful to geologists, economic or otherwise. 
Few people know much about British salt outside of Cheshire, and 
hardly anyone could give even a vague description of the salt-fields 
of Lancashire, the Isle of Man, and Somerset, which are mainly recent 
discoveries ; as to the horizon of the Middlesbrough salt deposits 
there still seems to be room for some doubt. Some very interesting 
facts are recorded as to the discovery of salt-beds in the borings at 
Market Weighton and at Barlow, near Selby. In both these cases 
the salt is in the Upper or Middle Permian. The bed is 20 feet thick, 
and Barlow seems to be near its western limit, but nothing is known 
as to its possible eastward extension. 
WISSENSCHAFTLICHE FoRSCHUNGSBERICHTE, BAnD IIT: ALLGEMEINE 
GEOLOGIE AND STRATIGRAPHIE. By Dr. A. Born. pp. 145. 
Steinkopff, Dresden and Leipzig, 1921. Price 5s. 7d. 
N a general introduction to this series the editor, Dr. R. EH. 
Liesegang, remarks that five years have been torn out of the 
lives of most men of science by the war. These small books are an 
attempt to supply fer each subject a bibliography of what has 
appeared during the years 1914-18, together with, in the case of 
many subdivisions, brief summaries and criticisms of the contents 
of the more notable publications. We cannot help pointing out, 
however, that this geological volume is of a very one-sided character. 
Nearly all the references are to German, Austrian, and Swiss 
publications, with a few American ones ; in a fairly lengthy search 
we have discovered one quotation of a paper in the GEOLOGICAL 
MacaziIne, one French and one Italian paper. But as a record of 
what has been done in German and Austrian geology during the 
war years the book will be most useful. 
