Reviens — Mficiiair's Geology of the Grampians. 31 



levels must have tended to concentrate the coarser drift material, but 

 we cannot suppose that the accompanying slight transportation has 

 had any effect in modifying the general distribution of the boulders. 



On considering- the number of boulders observed, and the fact that 

 these must of necessity be merely a small proportion of the total 

 number derived from the intrusion, the result is somewhat surprising. 

 If this may be taken as an indication of the transport of material 

 throughout the whole Strathblane Valley, the amount of modification 

 which that valley has undergone at the hands of the ice must have 

 been very considerable. It is highly probable, however, that much 

 of the material may have been in the condition of a talus before the 

 advent of the ice, but that obviously does not affect the question 

 of the extent of erosion by the ice. 



Through the kindness of Dr. Home I have been allowed to place 

 on my maps a number of observations on Glacial Striae from the 6 inch 

 working copies of the Geological Survey Maps. 



I?, E "V^ I E "W S- 



I. — The Geologt and Scknery of the Grampians and the 

 Valley of Stkathmore. By Peter Macnair, F.R.S.E., F.G.S., 

 Curator of the Natural History Collections in the Glasgow 

 Museums, etc. 2 vols. 8vo. pp. xiv +195 and xii + 199, 

 with 163 plates and 10 folded and coloured maps and diagrams. 

 James MacLehose & Sons, Glasgow. 



IN two handy volumes abounding in a wealth of illustration the 

 author presents an account of the geology of a wide but ill-defined 

 tract which centres round Perthshire. That great structural break, 

 the Highland boundar}- fault, cuts the region into two parts. The 

 one lies within the Highlands upon the metamorphic rocks, whilst 

 the other stretches over the foot-hills of Old Red Sandstone, the 

 plain of Strathmore, and includes the volcanic ridges of the Ochil 

 and Sidlaw Hills. The title of the book, therefore, is misleading, 

 for only a portion of the mountainous region sometimes called 

 the Grampians receives any attention, and by the inclusion of 

 ' Scenery ' in the title a fuller and more scientific treatment of its 

 evolution might be anticipated. The area actually described presents 

 such varied characters that naturally it inclucles many points of 

 general interest to geologists. Some of the unsolved problems, such 

 as the metamorphism, age, and structure of the Highland schists, 

 are the largest with which the Scottish geologist has to deal. For 

 his description the author has culled information from many available 

 sources, whilst he has himself an intimate knowledge of certain 

 tracts, which are treated in great detail. On most subjects the views 

 here put forward do not differ essentially from those generally 

 accepted. A special claim is made that the book contains a considerable 

 amount of original i"eseax'ch, but it would be difficult to show that 

 its publication has advanced any of these problems a single step 

 towards solution. Whole chapters of the book are simply reproductions 



