318 Reviews—Dutton’s Grand Canon, Colorado. 
paratively easy identification of the affected beds. Some of the sec- 
tions figured are of small horizontal extent (no visitor to Christiania 
should neglect to visit the one in the street below the Trefoldigsheds 
Kirche, in the heart of the city), whilst others extend over a con- 
siderable distance. It may be remarked that these foldings occur in 
an area not very far distant from the Highlands of Scotland, which 
are also composed of Lower Paleozoic beds folded amongst the 
Archean rocks. Some of these foldings also may be very complex, 
for the structure of the two countries is very similar and points to 
movements of a similar character. 
The last section of Professor Brogger’s book treats of the contact 
metamorphism of the beds of stages 1—3 against the granite of 
Eker. The results he arrives at are of great interest, from their 
bearing upon the vexed question of regional metamorphism, but as 
this part of the work has been noticed very fully elsewhere (Nature, 
vol. xxvii. p. 121), it is unnecessary to comment upon it here. 
The correlation of the beds around Christiania with those of 
Britain has been treated of somewhat fully above, because it seems 
especially important that the admirable discussion of the relation- 
ships of the Tremadoc Slates should be readily accessible to English 
readers ; sufficient has, I hope, been said of the other parts of the 
book, to show the great value of the work to specialists in all 
branches of geology. J. H. M. 
TV.—Tue Tertiary History oF THE GRAND CaNon District, wiTH 
Attias. By Cuarence E. Dutton, Captain of Ordnance, U.S.A. 
pp- 246, Plates 42, Atlas Sheets 23. (Washington, Government 
Printing Office, 1882.) 
HAT a Government Scientific Department of a great country 
may accomplish, when it has the requisite support, has long 
been apparent from the reports of the Geological Survey of the 
United States. Printed in quarto in a clear type upon the best of 
paper, and accompanied by coloured atlases in elephant folio, and 
also by a profusion of views and other illustrations along with the 
letterpress, they surpass all other publications of the kind with 
which we are acquainted. The monograph by Captain Dutton upon 
the Grand Canon of the Colorado, on account of its subject, possibly 
surpasses its predecessors in interest. 
Most geological students in this country have had their wonder 
excited by the frontispiece to Dr. Geikie’s Text Book of Geology. 
It is reduced from one out of the twelve coloured views of a 
marvellous region given in the Atlas to this work. The original 
picture measures 29 inches by 18. Hence may be gained an idea of 
the illustrations of the atlas. Besides these views it contains twelve 
maps. The quarto volume is also profusely illustrated with a map, 
sections and views; and the frontispiece is a most delicate and 
artistic specimen of chromo-lithography. The tints of the rocks are 
like those of an exquisite silken fabric, and yet we are assured, by 
the author's descriptions of the scenery of that land of marvels, that 
