36 
SURVEY OF THE COLORADO OF THE WEST. 
those made by Clarence King to the north, and those by Dr. Hayden 
on the east, all of the work could be properly proved and correlated with 
the other surveys. 
The great structural lines of geology and topography in the region 
already surveyed extend to the north through the country under con- 
sideration ; in fact, it is a part of the same region of canons and cliffs, 
a region entirely unique in geographic science. 
To complete the survey of the country under consideration by the 
methods which were adopted during the latter part of our work, an 
appropriation of $16,000 will be necessary. 
We have already gained some knowledge of the country, its topog- 
raphy and geology ; we have men instructed and skilled in the work ; 
we have a train, instruments, and camp-equipage sufficient, with a very 
little addition, to serve for this purpose, and doubtless the work could 
be performed now at a much less expense than it could were it neces- 
sary to organize an original party for the same. 
In case it should be decided to prosecute this field-work the coming 
season, the appropriation for the office-work should be cut down from 
$25,800, as above estimated, to $15,000, thus making a total appropria- 
tion of $31,000. 
I beg leave to call your attention to the fact that heretofore all the 
work has been accomplished for which estimates have been made, and 
to state that the estimates above have been carefully considered, and 
that they will be sufficient to accomplish all that has been represented, 
but that the work cannot be done for a smaller sum. 
Invoking your attention to the statements made concerning the meth- 
ods and the extent of the work which has been accomplished, and to 
the estimates which I have submitted for the continuance of the survey, 
1 am, with great respect, your obedient servant, 
J. W. POWELL. 
Prof. Joseph Henry, 
Secretary Smithsonian InstitMion , Washington , Z>. C. 
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