366 



of examination of urine and also of blood, pus, etc. The conclud- 

 ing section is devoted to the technique of post-mortem investigation 

 and the chief facts concerning pathological anatomy. As is often 

 the case with text-books avowedly written for examination 

 purposes, the facts are given in a somewhat abrupt and disconnected 

 style, and are indeed probably intended rather as a series of 

 systematised notes, to be supplemented by class teaching, than as 

 a logical treatise on the subjects dealt with. From this point of 

 view the book may certainly be commended, although the illustra- 

 tions are rather poor and not very helpful. D. J. S. 



Metallography. —An introduction to the study of the structure 

 of metals, chiefly by the aid of the microscope. By Arthur 

 H. Hiorns. 7 x 4| in. xiv. -}- 158 pages. 96 half-tone 

 figures on 32 plates. London, 1902 : Macmillan & Co. 

 Price 6s. 



The study of the internal structure of metals and alloys by 

 means of the microscope was begun by Dr. Sorby as long ago 

 as the year 1864, when he examined some specimens of steel in 

 Shejffield. The seed which he sowed, however, did not germinate 

 for many years, and little was done, either by himself or by 

 others, until about the year 1885. Since that time the labours 

 of Martens, Osmond, Wedding, Charpy, Roberts-Austen, Stead, 

 Arnold, Sauveur, and many others have elevated metallography 

 into a new branch of science. Numerous researches have been 

 carried out and their results communicated to various learned 

 societies. A periodical, the " Metallographist," devoted entirely 

 to the chronicle of the work that is being done on the subject, 

 has been in existence for over four years, and engineers and 

 metallurgists are becoming more and more alive to the im- 

 portance of following the development of the science. Already 

 metallography is being taught as a separate subject in some of 

 the universities and technical schools. Yet, wonderful to relate, 

 no text book on the subject in the English language existed 

 before the publication of the work under review. The papers 



