Eevieivs — Elsden's Applied Geology. 479 



Britain could be issued by the Survey, it was evident that the old 

 forinational views of the Upland succession must first be rigidly 

 tested in the field in the light of the more recent discoveries and 

 opinions ; and in the year 1888 Messrs. Peach and Home, already 

 long familiar with zonal methods in their brilliant work in the 

 North- West Highlands, were deputed by the Director - General to 

 make a complete revision of the Upland geology. During the 

 years 1888-1899 they have from time to time been busied at this 

 task. In the words of Sir Archibald Geikie in his preface to the book, 

 " they have traversed, sometimes repeatedly, the various sections of 

 the strata across the length and breadth of the Southern Uplands. 

 They have mapped on the ground the successive rock-zones, traced 

 the variation of these zones from one end of the region to the other, 

 and made voluminous notes as regards their stratigraphy and 

 palseontology." 



The greater part of the present volume is the result of this 

 revision, which, it is plainly evident, has been to all concerned 

 a labour of love. Chas. Lapwokth. 



{To be concluded.) 



IL— Applied Geology. Part TI. By J. V. Elsden, B.Sc, F.G S. 

 8vo ; pp. vi, 250. (London : "The Quarry " Publishing Co., 1899.) 



THE first part of this work, a slim volume bound in cloth, was 

 noticed in the Geological Magazine for November, 1898 

 (p. 521). We then referred to the difficulties of the task which 

 the author had undertaken. Evidently he has devoted great pains 

 to his work, but, as might be expected, he cannot deal equally nor 

 sufficiently fully with ail sections of such a very comprehensive 

 subject. As an introduction to the student and as an aid to the 

 teacher, the book will no doubt be found useful ; but there can be 

 no question that the mining engineer, and those who require special 

 information concerning building-stones, cements, water-supply, etc., 

 must seek it in works dealing particularly with those subjects. 



The author has gleaned facts from all parts of the world, and 

 from a number of original sources, but he only occasionally ac- 

 knowledges the information which he has utilized in the text, and 

 in the accompanying illustrations. There is perhaps too great a 

 tendency nowadays to regard published information (both text and 

 figures) as common property, and to avoid burdening the text with 

 references; but we cannot help thinking that the value of the 

 present work would have been enhanced by references to works 

 in which fuller information could he obtained. The illustrations 

 (a few of which are acknowledged) have been reproduced in a bold 

 diagrammatic style. A number of microscopic sections of rocks 

 are also introduced, but on this subject, as on some others where 

 special knowledge and training are essential, a little knowledge may 

 be a danojerous thin or. 



The present work begins with chapter vi, thus continuing the 

 subject-matter of Part I, but the paging is commenced anew. The 

 author now deals with ore-deposits, building and ornamental stones, 



