348 
MAPS AND ILLUSTRATIONS. 
offer a general sketch of these mountains, which, imperfect as it may be in details, 
and particularly in the demarcation of the outline of the formations, will still, we 
trust, he found to assign the chief rocks of the Ural chain and Timan ridge to 
their proper places in the geological series. 
Provided with the useful geographical map compiled by Humboldt and Rose, 
it was at first our intention not to attempt any other definition of the Ural than 
that which is given in our general geological map of Russia (PI. VI.). The Imperial 
countenance with which we were favoured, led, however, to the acquisition of some 
geographical data with which our precursors were not furnished, and we, therefore, 
caused a separate map to be prepared of all the Uralian regions from the north of 
Bogoslofsk to the south of Orenburg, which we have endeavoured, however im- 
perfectly, to colour geologically 1 (PI. VII.). 
In the following descriptions, therefore, the reader will do well to consult both 
the general map, in which the Ural forms the eastern boundary, and also the de- 
tailed map in which the relative positions of places can be better traced, rhe 
geographical materials for the construction of the latter are chiefly derived from 
the Prussian map, and on it we have inserted the knowledge we obtained from 
local surveys of Russian officers at the Zavocls of Bogoslofsk, Ekaterinburg and 
Zlataust, as well as what we could derive from the writings of Helmersen, Hoff- 
man, Humboldt, &c. The chief additions, however, in our map appear in the 
southern divisions of the chain, and are taken from original field sketches exe- 
cuted by the staff under the orders of General Perovski, late Governor- general of 
Orenburg, and kindly presented to us by that distinguished officer. Lastly, the 
coloured sections which we have prepared (Plates II., III., IV. and V.), may, 
we trust, explain better than pages of writing, the dominant structure of the Ural 
Mountains, as seen in a number of parallels throughout nine degrees of latitude. 
With due attention, therefore, to these coloured sections, and an occasional glance 
' Both maps have been prepared in London by Mr. Arrowsmith, under the direction of Mr. Murchison, 
who has published the larger one in the last volume of the Royal Geographical Society. The original map 
of the South Ural, as compiled by order of General Perovski, from the surveys of the Russian staff under 
General Rakosofski, and now deposited in the Apartments of the Royal Geographical Society, is a work 
highly creditable to the officers, who prepared it from their field sketches. Ihe last corrections of the 
Map, PI. VII. are taken from the labours of Mr. J. Khanikoff, who is preparing a Russian map of these 
territories, and we refer with pleasure to a new geographical memoir by him upon the Southern Ural 
and adjacent regions, which Mr. Murchison has communicated to the Royal Geographical Society of 
London. 
