Geology and Mineralogy. 67 
region was one which was unmapped, unstudied, and of which 
nothing but a few isolated details was known. The value of the 
work accomplished can be best appreciated when the difficulties 
which had to be overcome are underst tood. 
e pone te volumes in the series, now published, presents a 
systematic statement of the geological facts taken in order . 
geological time, collected by Mr. King and his associates, Mess 
ague and Emmons, with the conclusions which he himself hi 
drawn from them, The detailed presentation of these facts, in their 
geographical order, had already been given in sr meen " on De- 
scriptive Geology (noticed i in this Journal, vol. xvi, p. 234). I 
thus bringing together in a single volume the grand results of his 
Survey, Mr. King has given much greater and more permanent 
value to the labors of himself and his associates. The clear and 
ories advanced are presented, is worthy of high praise; Mr. King’s 
graceful pen never showed itself to better advantage. It is per- 
haps unnecessary to add that the appearance of the volume is all 
that could be desired ; the many plates are executed in the best 
conclusions reach ae 
Tenth Annual Report of the United States Geological and 
Decpraphiaat Survey of the Territories. Being a Report of Pro- 
oo. of the Exploration for the year 1876, by F. V. Hayprn, U: 
Sides the opening letter of the geologist in charge, the following 
c. - White, On the geology of a portion of 
. M. Endli th 
