336 SCIENCE PROGRESS 



their aim is to outline principles and to illustrate them by typical industrial 

 examples, and throughout the work one is conscious of the practical value 

 of the subject. The book is very well arranged and the illustrations are 

 representative and excellent. After considering various forms of apparatus, 

 the methods of preparing specimens, and the constitution of alloys, 

 the authors devote a long chapter to the important subject of the relation 

 between equilibrium diagrams of alloys and their properties and correct 

 mechanical treatment, and then in the two subsequent chapters the industrial 

 application of metallography to ferrous and non-ferrous metals is discussed. 

 It is scarcely necessary to mention that alloy steels receive careful attention. 

 The final section of the book is devoted to macrography and its industrial 

 applications and should prove particularly useful. 



The authors' definition of " Metallography " is not suiSciently compre- 

 hensive, for they are only defining micrography as applied to metallurgical 

 specimens. Metallography is concerned with the internal structure, the con- 

 stitution, and the physical properties of metals and alloys, and even includes 

 macrography. 



The research work of the authors is well known, and they have drawn 

 freely from their papers both for descriptions and illustrations. Nearly all 

 the statements made are generally accepted and the book can be recommended 

 with confidence. The student will find it a well-balanced introduction to the 

 study of metallography ; also, it should prove distinctly valuable to the 

 professional man and the engineer, as the subject is dealt with in an eminently 

 practical manner ; while for the teacher there are many helpful suggestions 

 and much useful matter. 



Great care has been taken with the translation and in retaining the 

 character of the original, and the translator is to be commended on the 

 excellence of his work and for the good service he has rendered to all interested 

 in metallography. 



ZOOLOGY 



The Biology of the Sea-shore. By F. W. Flattely and C. L. Walton, M.Sc. 

 [Pp. xvi + 336, with 16 plates and 23 text figures.] (London : Sidgwick 

 & Jackson. Price i6s. net.) 

 The habitat with which this work treats is one of perennial interest not merely 

 because it is the traditional playground of both young and old, but because 

 this meeting-place of land and water is the battle-ground alike of animate 

 and inanimate nature. Here are encountered the special problems of the 

 amphibious condition, the periodic alternation of inundation and desiccation, 

 the effects of wave impact and all the attendant defects and advantages of 

 mobility. 



The great value of this interesting volume is that it constitutes a definite 

 attempt to bring before the reader the relations of the animals which inhabit 

 the tidal zone to the peculiarities of their environment. Indeed, it is one 

 of the few real efforts to deal with a regional fauna from a definitely ecological 

 standpoint. 



The title is a trifle misleading as the flora of the tidal zone receives but 

 scanty treatment, and even in a work more professedly zoological the very 

 important role of plants, for example in modifying the mobility of the sub- 

 stratum, might well have received more adequate consideration. The method 

 of presentation, too, is somewhat disconnected and, in parts, unnecessarily 

 technical for the general reader, a defect which is enhanced by the indices, 

 in which, for example, common species are only entered under their Latin 

 binomials, and subject headings are all too few. 



Despite these limitations, however, the suggestive text will, we feel sure, 

 be perused with interest and profit by the general reader and the zoologist, 

 who will alike find in these pages the source of added enjoyment when next 

 they wander in the tidal zone. E. J. S. 



