Reviews—H. B. Woodward’s Geology of the London District. 567 
rough diagrams rather than figures which, while giving the necessary 
illustration, embellish the page. Modern process-blocks are far from 
having attained to the perfection which is to be found in many of the 
old-time woodcuts. 
It will be eminently pleasing to paleontologists and, indeed, to all 
scientific workers to know that the Trustees of the British Museum 
have added this Descriptive Catalogue of the Oxford Olay Reptiles to 
the long list of their admirable publications. We await with some 
impatience the publication of the second volume; and in the mean- 
time congratulate Dr. Andrews on this most successful completion of 
the first part of his valuable work. 
BM eNe 
II.—Mewnorrs oF tHE GronoeicaL Survey, Eneranp AnD WALES. 
THE Gxrotocy or tHE Lonpon Disrricr (being the area included in 
Sheets 1-4 of the special Map of London). By Horace B. 
Woopwarp, F.R.S. London: printed for H.M. Stationery Office, 
and sold by EH. Stanford, Long Acre, and T. Fisher Unwin, 
Adelphi Terrace. 8vo; pp. viii and 142, with a small contour- 
map of the London District. Price 1s. Sheets 1-4, price 1s. 6d. 
per sheet. 1909: 
f{\HIS memoir was issued early in the present year (1910), and is 
intended to carry on The Guide to the Geology of London and the 
Neighbourhood, prepared by that indefatigable geologist Mr. Whitaker 
and published in 1875. That work reached its s¢zth edition in 1901, 
and is now out of print. The four-sheet map now issued, printed in 
colours (which is less expensive and slightly smaller than that published 
in 19038), is largely founded on Mr. Whitaker’s work, and also on 
subsequent work by Horace B. Woodward and other members of the 
Survey. 
‘No one,” says Dr. J. J. H. Teall, ‘‘can write on the geology of 
the neighbourhood of London without being indebted to the work 
of the late Sir J. Prestwich and of Mr. Whitaker. In the early memoir 
on The Geology of the London Basin, and in the two volumes on 
The Geology of London, Mr. Whitaker not only recorded all the facts 
gathered during the progress of the Geological Survey, but dealt fully 
with the observations of other geologists, adding his own criticisms 
on divergent views ... Though no effort has been spared by 
Mr. [ Horace] Woodward to acknowledge the sources of information, 
it has proved to be impossible to do justice to the voluminous literatur 
within the limits of so small a memoir.” 
The four new sheets which the memoir is intended to explain and 
describe have each an zmsede coloured area of 184 inches by 123 inches, 
with explanation of colours and formations on their outer margin, 
the scale given being 1 inch to 1 statute mile, their united surfaces 
covering an area of 363 x 244 miles. They are called ‘‘ Drift Maps”, 
but they really show the extent of the strata or geological formations 
which occur immediately beneath the soil. As examples we may 
mention the Thames Valley Gravel, the Bagshot Sand, the Thames 
Valley Brickearth, the London Clay, the Boulder-clay, the Chalk, and 
the Peat which occurs in the Alluvium of the Marshlands. 
