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enough. Like all Mr. Heath’s works, this seems to he well adapted to its 
purpose of exciting a love of nature and a desire for studying natural objects in 
its readers’ minds, and few books could be more appropriately placed in the 
hands of young people who have the good fortune to be able to pass any 
portion of the earlier months of the year among the rural scenes which it so 
successfully depicts. 
GEOLOGY OF THE LONDON DISTRICT.* 
TITTE are glad to be able to announce the publication of a third edition of 
» ▼ Mr. Whitaker’s memoir on the Geology of the London district, the 
explanation of the Geological Survey map of that area, and of the geological 
model of London, which may be seen in the Museum of Practical Geology in 
Jermyn Street. The book, as we stated in noticing its first issue, affords an 
excellent summary of the geological phenomena observable in London and 
its immediate neighbourhood, and Mr. Whitaker has carefully worked into 
it the results of recent investigations, some of which are of considerable 
interest and importance. The most important of all the additions are those 
relating to the demonstration of the existence of a great ridge of Palaeozoic 
rocks under the London district, upon which so much light has lately been 
thrown by deep borings in quest of a supply of water. All these are noticed 
in some detail, and at p. 19 there is a very useful table showing their depths 
and the various formations passed through in sinking them. 
* Guide to the Geology of London and the neighbourhood. By William 
Whitaker, B.A., F.G.S, Third edition, 8vo. London : Longmans and Stan- 
ford, 1880. 
