l6 FLORIDA GEOLOGICAL SURVEY SIXTH ANNUAL REPORT. 



also facilitate the study of the soils which bear well known rela- 

 tions to drainage and moisture conditions. In detailed geologic 

 mapi^ing and in the study of the mineral resources, topographic 

 maps are practically necessary for the final reports. 



Topographic maps find many additional uses. They are oi 

 very great assistance in laying out and developing a system 

 of public roads, showing as they do the relief of the land including 

 hills, depressions and valleys. In planning the location of rail- 

 roads, canals, waterways, or other public improvements they are 

 of great assistance. Finally they afford to the land owners, as 

 ■well as to the citizens in general, the manifold conveniences of a 

 well-made and accurate map. 



CO-OPERATIOX WITH THE UNITED STATES GEOLOGICAL SURVEY IN 

 THE PREPARATION OF TOPOGRAPHIC MAPS. 



Many of the States co-operate with the National Geological 

 Sui"vey through their respective State Survey organizations in the 

 preparation of topographic maps. The usual basis of such co- 

 operation is an equal contribution of funds on the part of the 

 State and National Survey. The plan of mapping followed is 

 that already developed and established by the National Surv^ey. 

 The men employed in the mapping are the expert topographic 

 mappers already in the employ of the National Survey. The 

 following States are either now co-operating or have in the past 

 co-operated with the National Geological Survey in this work: 

 Alabama, California, Connecticut, Illinois, Iowa, Kentucky, Louis- 

 iana, Maine. Mar^dand. Massachusetts. Michigan. Mississippi, Mis- 

 souri, New Jersey, New York, North Carolina, Ohio, Oklahoma. 

 Oregon, Pennsylvania, Rhode Island, Tennessee, Texas, Virginia 

 and West Virginia. 



It is probable that such co-operation can be secured in the 

 preparation of the topographic maps of Florida, thus practically 

 doubling for the State any appropriation made by the Legislature 

 for this purpose. The Director of the United States Geological 

 Sur\'ey has repeatedly expressed his willingness to co-operate with 

 the State Geological Survey in the preparation of topographic 

 maps, meeting any appropriation made by the State with an equal 

 amount so far as funds permit. An appropriation made for the 

 preparation of topographic maps may ])e so framed as to admit 



