324 Geographical Notes. 
The work embraces a very complete scientific a of a 
section of country which traverses, from west to east, nearly the 
entire Cordillera system. e rocks at our wit pba! 
already those of the Atlantic formationé, and are being exten- 
sively studied by a number of geologists 
e department of mining industry our labors have been com- 
pletely worked up, and the volume and accompanying atlas, 
embracing the elaborated results of our three years’ study, 
imate. 
ed, the series is icdened oe Fike dy, firs ‘oe 
work cop eastieal map, bee which shall appear all the eatures 
of the country surveyed ; second, a series of geological maps, ti 
trating the formations ie eee soils, alkaline déposits, a and t 
distribution of arable land; third, a general report, which, in t 
synthetical manner, shall describe the history of the formations 
val o 
meee lithological structure of each family of rocks, rag ee 
upon the volcanic and glacial’ages; and an attempt to ie & 
present physical conditions, and an account of a pees | 
matic change g on. 
8 appendices to this, the second, third, fourth, and ii 
umes will treat of technical geology, zoology, and mining 10 
(e) Surveys and Reconnaissances of Western Rivers oe 
the great variety of enterprises of this choiactas with “whic 
Engineer Corps are charged, the following, — were iD ‘a 
gress sass the year 1870-71, seem to us as of most 
: A survey of the Cumberland river under the direction» 
Major G. Weitzel, Corps of Engineers, which was made by 
S. T. Abert and a party of twenty-one men. The recon® 
