Reviews and Book Notices. 287 



to that I should think it is most numerous' about Aberystwyth, 

 where Mr. Hutchings has several every year to preserve. 

 This is the only district from which the erythristic variety 

 has been obtained ; the strain is remarkably persistent, 

 animals with the red colouration having been obtained here 

 for many years past. — H. E. Forrest, Shrewsbury. 



: o : 



Coal and What We Get From It, by Raphael Meldola, S.P.C.K. 

 210 pp., 4/6 net. This veritable ' Romance of Applied Science,' by our 

 old friend Prof. Meldola, is doubtless well known to our readers. We 

 here merely record that the little volume has now reached its seventh 

 thousand, which is some indication of its popularity. At the price 

 named a well printed and well bound volume is not dear, and when the 

 text has been written by an authority of the standing of Prof. Meldola, 

 the volume is cheap indeed. 



The British Museum (Natural History) has issued a Handbook of 

 Instructions for Collectors. 222 pp., 5/-; and .seeing that this has 

 reached the fourth edition, it speaks for the popularity of this excellent 

 little work, which is the result of the experience of specialists in the 

 different branches of Natural History dealt with. Not only are 

 Mammals, Birds, and other larger animals referred to, but even 

 Sponges, Spiders, Flies, Marine organisms, and various kinds of Plants, 

 Fossils and Minerals are dealt with. 



A Text -book of Oceanography , by Dr . J . T . Jenkins . Constable 

 & Co : 206 pp., 15/-. The impetus given to the study of Oceanography 

 by Professor Herdman in his recent presidential address to the British 

 Association will doubtless have much effect in furthering the study of 

 this fascinating science, and now that Dr. Jenkins' book has appeared, 

 it enables those interested to get a little more inforihation of a practical 

 nature than is possible from Dr. Herdman 's address. This book is very 

 well illustrated, and can thoroughly be recommended to students. 



The Tin Resources of the British Empire, by N. M. Penzer. 

 London : W. Rider & Son, 358 pages, 15/-. In this volume the author 

 deals in great detail with the Tin Resources of the World, including 

 localities as far distant as Hong Kong, Rhodesia and Tasmania, and by 

 the aid of various plans, diagrams and statistics, gives a comprehensive 

 survey of the Tin producing areas. So far as the British Isles are con- 

 cerned, the Tin Mines are confined to Cornwall and Devon, and as showing 

 the rate at which the value of the metal has increased in recent times, 

 in 1914, 581 tons realised ;£53,ooo, whereas the same quantity in 1918 

 realised ;£i 13,000. There is a chapter on Industrial Applications of Tin, 

 Prices, and the world's output, an extensive bibliography, and a good 

 index. 



L. Dudley Stamp has a lengthy paper ' On the Beds at the Base of 

 the Ypresian (London Clay) in the Anglo-Franco-Belgian Basin, in The 

 Proceedings of the Geologists' Association, Vol. XXXII., part 2. issued 

 May 9th. 



Among the contents of the ' Annual Report and Proceedings of the 

 Bristol Naturalists' Society,' recently issued, we notice 'Camouflage in 

 the Insect World,' by G. C. Griffiths ; ' The Life of a Diatom,' by C. 

 Bucknall, and 'The Pleistocene Formations of Claverham, ' by E. Greenly. 



We learn from the Daily Mail, a few days ago, that the ' experiment 

 at the Sunderland Museum where blind children are taught to " see " 

 the exhibits by touching them with their hands,' which was described 

 at the Hull Conference of the Museums Association in 1913, is still 

 ' in progress,' and if the animal there figured, which we presume by 

 the tusks, is a walrus, it seems not altogether an affliction that the 

 children are blind. 



1921 Aug. 1 



