88 Trans. Acad. Sci. of St. Louis. 
In the year 1858 was published the map compiled by Lieut. 
G. K. Warren to accompany the reports of the Pacific railway 
surveys. It is contained in Vol. XI of the series of reports. 
In preparing this map Lieut. Warren studied carefully many 
of the previously published maps which have been described 
here, and he utilized the various astronomical determinations 
of the earlier exploration, though in a discriminating way ; he 
also had available the Land Office records and to these were 
added the data obtained by the newly executed surveys of 
the various practicable railway routes to the Pacific ocean. 
The result was, consequently, a map much in advance of any- 
thing so far published, both as to accuracy of location and 
amount of detail included. A copy of a tracing of this map 
is presented here, and a brief inspection will suffice to show 
that, for the scale used, a much better outline map of the 
State could hardly be prepared from our best maps of to-day. 
Fie. 13. WARREN MAP — 1857. 
itial Merid. at Greenwich. 
With the Warren map and the results of the Pacific railway 
