464 Reviews and Notices of Booh* 



in iton, and an investigator into its properties, and the processes 

 of its manufacture, render it one of the most complete books that 

 .can be consulted. For the general reader, who wishes to be in- 

 formed about a branch of manufacture and commerce of the 

 highest value and importance to all countries, and for those who 

 are themselves engaged in any department of the iron trade, this 

 work will prove invaluable, and cannot be too strongly recom- 

 mended. 



jFirst Sketch of the New Geological Map of Scotland ; with 

 Explanatory Notes. By Sir Roderick I. Murchison, D.C.L., 

 F.R.S., Director-General, and Archibald Geikie, F.R.S., F.G.S., 

 Geologist, of the Geological Survey of Great Britain. Con- 

 structed by A. Keith Johnston, Geographer to the Queen, 

 Edinburgh : AV. & A. K. Johnston, and W. Blackwood & 

 Sons. London : E. Stamford, Charing Cross. 



The leading object of the projectors of this map, as explained 

 by Sir Roderick Murchison, is to lay the basis of a new classifi- 

 cation of the rocks of Scotland, with the view of carrying out to 

 their ultimate application the principles first promulgated by 

 Hutton. For this end the careful explorations of Sir Roderick 

 himself, and of the other skilful geologists by which he has been 

 assisted, and to which the science of geology owes in no small 

 measure its rapid development, have been embodied in the map 

 with an amplitude and a distinctness which renders the geolo- 

 gical structure of the country patent to the eye, even of the most 

 unitiated, at a glance. To simplify it all the more, there is placed 

 along its margins transverse sections through different parts of 

 the country, showing the general succession of the rock masses. 

 We have first, a generalized section of the crystalline rocks of the 

 Northern Highlands, from the Hebrides across Sutherland, to 

 Brora ; secondly, a general section of the country from the north- 

 west promontory of Skye to the Cheviot Hills ; thirdly, one from 

 Ben Lomond to the Cheviot Hills ; and, fourthly, a detailed sec- 

 tion of the structure of Arthur's Seat, as worked out by Mr. Geikie 

 during the progress of the Geological Survey in Scotland. The 

 map, while it presents a complete geological picture of the coun- 

 try, is distinguished from all the other maps that have preceded 

 it, in embracing all the most recent discoveries, and in correcting 

 various errors into which earlier geologists were led while con- 



