REVIEWS 359 



about Jurassic. The monzonite-like rocks appear to be younger than the 

 gray granite, which would indicate that they belong to the Cretaceous. 



The conglomerates are amongst the younger rocks. The Lake Mountain 

 conglomerate is supposed by Mr. McConnell to be Tertiary. It bears a 

 strong resemblance, both lithologically and stratigraphically, to the con- 

 glomerates associated with the Tertiary volcanics on the Kettle River, which 

 are supposed to be of Tertiary age. The Rossland granite, which sends 

 dykes through the conglomerates both on Sophie Mountain and on the Kettle 

 River, is evidently younger than these. Dr. Dawson has observed granite 

 very much like the Rossland granite, cutting the Cretaceous rocks, in the 

 Kamloops district. The Rossland granite, again, is newer than some of the 

 basalts, as inclusions of the latter were found in it, and reddish porphyry 

 dykes, seemingly identical with those from this granite, were observed cutting 

 the lower volcanic beds. There seems good ground, therefore, for supposing 

 this granite and the accompanying porphyries to be Tertiary (R. W. Brock). 



c. 



Aus den Hochregione?i des Kankasus. Wanderungen Eslebnisse, 

 Beobachtungen von Gottfried Merzbacher. Two vol- 

 umes, 1920 pages, 246 illustrations from photographs, 3 

 maps. Leipzig: Duncker & Humblot, 1901. Price, 40 

 marks. 



This is another great work on the Caucasus, which may be com- 

 pared favorably with that by Freshfield. The two large volumes by 

 Merzbacher deserve a more extended review than it is possible to give 

 them at this time. They present in very attractive form the result of 

 much labor in exploring the peaks and snowfields, the glaciers and 

 valleys of the lofty Caucasus, as well as in study and observation of the 

 country and its peoples. Much labor has also been bestowed upon 

 the preparation of the book, which appears in the character of the 246 

 illustrations, most of which, from photographs taken by the author, 

 have been redrawn with great success artistically, especially those by 

 E. T. Compton. The three topographic maps of the region, on a 

 scale of 1 : 140,000, furnish a great deal of valuable detail. A most 

 convincing evidence of the care taken with the preparation of the book 

 is the index of 117 double-columned pages. So also are the frequent 

 bibliographic references. 



The first chapters are devoted to the general discussion of the 

 orography and structure of the high Caucasus; their glaciers, hydrog- 

 raphy, passes, and subdivision into three groups, western, central, and 



