Winslow —The Mapping of Missouri. 95 
progress. The work of the First and Second Geological 
Surveys included little original work in the line of geographic 
mapping. Accompanying the county reports of these surveys, 
there are small maps published on scales of three and four 
miles to the inch of some thirty counties. These maps con- 
tain, in addition to the geological matter, such facts of geog- 
raphy and topography as could be obtained from the Land 
Office plats and from published maps, supplemented by observa- 
tions made in the field while prosecuting geologic work. The 
counties are printed on separate sheets on which the town- 
ship range and section lines are shown, and the towns, railways 
and drainage; at times prominent elevations are indicated by 
hachure lines, but this only at intervals. The amount of 
detail shown on the different sheets is quite variable. In 
addition to these county maps, there were published under 
the Pumpelly management, as a result of original work, a 
topographic map of Pilot Knob and vicinity on a scale of about 
1200 feet to the inch, and, underthe Broadhead management, 
a contoured map of the Granby mining district on a scale of 
300 feet to the inch. 
The Third Geological Survey, now in progress, has under- 
taken, as part of its work, the preparation of detailed maps 
of different portions of the State. These maps include the 
details of the topography as well as those of the geology 
proper. The scale adopted is gz4,5 or about one mile to the 
inch. The area represented by each sheet is a quadrilateral of 
15” extent in latitude and longitude ; this may be, within the 
State, anywhere between 228 and 240 square miles. The size 
of the sheet, including the margin, is 163 by 20% inches. 
This work has been prosecuted during the field seasons of the 
years 1890 and 1891, and, as a result, there have been surveyed 
and plotted up to date ten sheets, distributed as shown on the 
diagram opposite p. 91. During the present field season three 
or four more will be surveyed. 
The map attached at the end of this paper is a printed copy 
of one of these sheets, from engravings on stone. As is there 
shown the drainage, the hypsometry and the cultural features 
are represented respectively in blue, brown and black, as on 
the sheets of the U.S. Geological Survey. The scale is, how- 
