WATER SUPPLY OE EASTERN AND SOUTHERN EEORIDA. 173 
United States Engineer at Jacksonville. Similar surveys made 
by the same office in 1879 supplied elevations from Fernandina 
Fig. 6.—Map of flowing area of Nassau and Duval Counties. The: 
area in which flowing wells can be obtained is indicated by shading. 
to Maxville and at various points along the St. Marys River.* 
In addition much information as to elevations has been obtained 
* Annual Report of the Chief of Engineers for 1880, pp. 973-1010. 
