. Science-gossip . n Hertfordshire to the north and inSurrey to the south of London, while the stiff blueclay known as the gault forms the lowest layer ofthe basin, and prevents the water from penetratingfurther into the earth. The pressure of the waterin Trafalgar Square therefore varies according asthe season is dry or wet in Hertfordshire and these fountains, and, indeed, many of theGovernment buildings at Westminster, are suppliedwith water, not from any artificial reservoir, butfrom one which has been constructed, and isconstantly replenished, by nature herself. Artesian wells
. Science-gossip . n Hertfordshire to the north and inSurrey to the south of London, while the stiff blueclay known as the gault forms the lowest layer ofthe basin, and prevents the water from penetratingfurther into the earth. The pressure of the waterin Trafalgar Square therefore varies according asthe season is dry or wet in Hertfordshire and these fountains, and, indeed, many of theGovernment buildings at Westminster, are suppliedwith water, not from any artificial reservoir, butfrom one which has been constructed, and isconstantly replenished, by nature herself. Artesian wells are quite common in France, asindeed they always are wherever the geologicalconditions are favourable. Paris at the presentday is to a large extent supplied by them, and thewater comes in some cases from so great a depththat it is quite warm when it reaches the is of interest to geologists, as showing that thetemperature of the earth increases with the ; April, 1897. 334 NOTICES BY JOHN T. CARRINGTON. Natural History of the Marketable Marine Fishes ojthe British Islands. By J. T. Cunningham, ,with a Preface by Professor E. Ray Lankester,, , 375 pp. royal 8vo, illustratedby 159 figures and 2 coloured maps. (London and New York : Macmillan and Co., Limited, 1896.)Price 7s. 6d. Although there are numerous natural historiesof British fishes, not one is quite like this mostuseful work on our marine food fishes. It wasissued under the auspices of the Marine BiologicalAssociation, as explained in the Preface by thePresident of the Association, Professor Lankester,the author being one of the scientific staff of theinstitution. He has devoted much attention to thelife-histories of marine fishes, not only at thePlymouth Laboratory but also in others atGranton, Cleethorpes, and elsewhere. Wehave not to read far into the pages of thiswork before we find a natural history of farmore intelligent character and scientific nature
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