556 Reviews—Geology of the Isle of Wight. 
they constitute the principal source of British supply, and also 
because they have been examined and described by competent 
observers. 
The frantic effort during the war to increase output, and/or 
obtain large profits must have resulted in Burma, as elsewhere, in 
bad development work and waste, more particularly as the greater 
part of the output was obtained from alluvial deposits and decom- 
posed ground, worked by sluicing methods. With the return of 
normal conditions, more reasonable methods of operation will be 
instituted, and Government control, necessary in such conditions, 
be made more severe. The description of the Australian deposits is 
complete, although the output from them is relatively small. 
Amongst foreign countries the largest supply comes from the 
United States, but China and Japan and the South American States 
and Portugal also produce appreciable quantities. 
The fall in the value of the raw material has brought about almost 
total cessation of work everywhere, and it will be interesting to see 
from which deposit the mineral can be obtained at the lowest figure, 
to meet the changed economic conditions of the future. 
H. K. Scott. 
A Snort Account of THE GEOLOGY or THE IsLE or WicuT. By 
H. J. Osporne Waite, F.G.S. Memoirs of the Geological 
Survey, pp. 219. With 1 Plate (coloured map), and 43 figs. 
London, 1921. Price 10s. net (paper covers). 
HE Isle of Wight, on account of its varied structure, its fine 
coast sections, and its abundant fossils, has always been a 
favourite subject for study by those interested in geology, and it 
has now been investigated by at least four generations of scientific 
men. The results of such study were first brought together in 
Bristow’s memoir, published in 1862, and revised by Mr. Clement 
Reid and Sir Aubrey Strahan in a second edition issued in 1889, 
but this work is now out of print. The present guide is intended to 
replace it, at least in part, and it gives a condensed but admirably 
presented account of what is now known upon the subject. It is 
written by one who on account of a long residence in the Island and 
an intimate acquaintance with its geological features is exceptionally 
well qualified for the task which was entrusted to him by the 
Geological Survey. 
After a short chapter on the main physical features, and con- 
taining a table of the formations, the author describes in order the 
stratigraphical series beginning with the Wealden and passing 
upwards to the Hamstead beds of the Oligocene. The section on the 
Chalk has been much amplified as compared with that in the earlier 
Memoir, and it contains several new diagrams and sketches of 
coast exposures. The account of the stratigraphy is followed by 
a chapter on the tectonic structure of the Island and the post- 
Oligocene disturbances to which it has been subjected, and here 
