26 



DISCOVERY 



tion and to include the most recent advances in each 

 aspect of the subject, but these advantages are purchased 

 at the cost of obscuring somewhat the relevance of certain 

 of the facts accumulated round the problems under dis- 

 cussion. It is written for the most part in non-technical 

 language, and should prove stimulating reading to anyone 

 with the smallest interest in the sexual problems of to-day. 

 Each chapter contains a useful bibliography. 



F. A. H. 



SHORTER NOTICES 



Examples in Optics. Compiled by T. J. I'A. Bromwich, 

 Sc.D., F.R.S. (Bowes & Bowes, is.) 

 One hundred and forty-four questions in physical 

 and geometrical optics, set in the Cambridge manner, for 

 honours students of applied mathematics. 



A Catalogue of British Scientific and Technical Books. 

 (British Science Guild, 6 John Street, Adelphi, W.C.2, 



105.) 



The British Science Guild is a national organisation, 

 founded in 1905, to promote the application of scientific 

 methods to social problems and public affairs. Its 

 latest activity in promoting the use of knowledge, and 

 thereby furthering the development of education, science, 

 and industry, is in producing this catalogue. Its com- 

 pilers have attempted to make a complete record of 

 scientific and technical books at present in print other 

 than those intended for primary schools and elementary 

 volumes of a like nature. Books at present out of print, 

 and American books even when published also in this 

 country, have been purposely omitted. The volume con- 

 tains more than six thousand titles, and the particulars 

 given for each book are author's name, title, size of page, 

 number of pages, date of last edition, name of publisher, 

 and current price. 



Particular care has been paid to classification, and the 

 compilers very wisely have called in experts in the dif- 

 ferent branches to assist. At the end of the catalogue is 

 a subject-index, and an index of authors and translators, 

 which serve to make reference quick and easy. 



The Making of Reflecting Surfaces. A Discussion by 

 members of the Physical Society of London and the 

 Optical Society held in November 1920. (The Fleet- 

 way Press, 5s.) 



This pamphlet, copies of which may be obtained from 

 the secretary of the Optical Society at the Imperial College 

 of Science and Technology, consists of a survey of the biblio- 

 graphy of metallic deposition on glass, with papers on the 

 processes of silvering mirrors, reflectors, quartz and glass 

 fibres, and cognate subjects, by H. N. Irving, J. W. 

 French, of Barr & Stroud's, F. Ellerman and H. D. Bad- 

 cock, of Mount Wilson Observatory, C. R. Davidson, of the 

 Royal Observatory, Greenwich, R. S. Whipple and W. 

 G. Collins, of The Cambridge and Paul Instrument Co., 

 Prof. Chas. Fery, of Paris, F. Simeon, of Messrs. Adam 

 Hilger's, Julius Rheinberg, and J. W. T. Walsh. Follow- 

 ing the papers is a report of the general discussion. 



Studies in North Africa. By Cyril Fletcher Grant. 

 (Simpkin, Marshall, Hamilton, Kent & Co., Ltd., 

 8s. td.) 



This is the abridged edition of a much larger work 

 published in 1912, 'Twixt Sand and Sea. And it has been 

 excellently abridged too, so that there is not a sentence 

 that does not convey to the reader the atmosphere of or 

 information about the " land of sand and ruin and gold," 

 as Swinburne described it. Mr. Grant has spent many 

 years in North Africa, and speaks -with, authority on the 

 successive waves of civilisation that have swept through 

 it from the arrival of the Phcenicians in 750 B.C. to that 

 of the French in 1830, and the wonderful ruins that these 

 civilisations have left in their tracks. 



We look forward to reading its companion volume that 

 is to appear later. The illustrations are excellent, but 

 we \vish that specimens of statuary and mosaic had been 

 included amongst them. 



Marvels of the Animal World. By W. S. Berridge, 

 F.Z.S. (Thornton Butterworth, Ltd., 7s. 6d.) 



A great deal of fascinating and out-of-the-way knowledge 

 has been gathered into these pages, which are popularly 

 written and well illustrated. Particularly interesting is 

 the chapter on " Poisonous Animals," but the reviewer, 

 after his OAvn experiences, advises no one to read it just 

 before retiring to bed ! 



Books Received 



{Books mentioned in this column may or may not be 

 reviewed in this number, or in a later number.) 



AGRICULTURE 



Dates and Date Cultivation of the 'Iraq. By V. H. W. 

 DowsoN, Agricultural Directorate of Mesopotamia. 

 (Part I, los. ; Part II, 5s. Printed and Published 

 for the Agricultural Directorate of Mesopotamia by 

 W. Heffer & Sons, Ltd., Cambridge.) 



ARCH.EOLOGY AND ANTHROPOLOGY 

 .4 Textbook of ArchcBology. By Prof. R. A. S. Mac- 



ALISTER, Litt.D. (Cambridge University Press, 50s.) 

 The Evolution of Civilization. By Joseph McCabe. 



(Watts & Co., 2S.) 

 Annals of ArchcBology and Anthropology, University of 



Liverpool. Edited by T. E. Peet. Vol. VIII, 



Nos. 3-4 . (Liverpool University Press and Constable 



& Co., Ltd., 65.) 



BIOLOGY AND BIOCHEMISTRY 

 Considerations sur I'Etre Vivant. Deuxieme Partie. Par 



Charles Janet. (Beauvais : ImprimerieDumontier 



et Hague.) 

 The Glands regulating Personality . By Louis Berman, 



M.D. (The Macmillan Company, New York.) 



GEOGRAPHY 



Exploration of Air : Out of the World North of Nigeria. 

 By Angus Buchanan, M.C. (John Murray, i6s.) 



