CONTENTS. 
PAGE 
Introduction . 85 
The area treated. 86 
Geology . 86 
Oiigocene . 86 
Vicksburg group . 86 
Apalachicola group .. 88 
Miocene . 89 
Pliocene . 90 
Pleistocene . 91 
Earth movements during the Pleistocene. 91 
Topography and Drainage . 92 
Elevations .. .. 92 
Rivers . 92 
The Lake Region. 93 
Climate . 94 
Temperature . 94 
Precipitation . 95 
Soils .. .... .......... 96 
General discussion of underground waters. 99 
Source . 99 
Annual rainfall . 99 
Disposition of rainfall. 100 
Amount available for the underground supply. 102 
Underground circulation of water. 102 
Cause of movement. 102 
Rate of movement. 102 
Depth of underground water. 102 
Hydrogen sulphide in underground water. 104 
Sulphur water not evidence of beds of sulphur. 106 
Sulphur deposits formed from hydrogen sulphide. 106 
Absence of hydrogen sulphide from certain waters in Florida..... 106 
Amount of hydrogen sulphide influenced by pressure.. 107 
Artesian water . 107 
Artesian water defined. 107 
Conditions necessary to retain artesian water... 108 
Artesian basin . 108 
Artesian slope . 109 
Artesian water from unconfined horizontal beds. no 
Artesian water from solution passages. in 
Source of artesian water in Florida..... in 
Formations supplying artesian water........ 112 
Depth of artesian water. 112 
Cost of wells . 112 
Increased flow with increased depth. 113 
Increased head with increased depth. 113 
Increased temperature with increased depth..... 114 
Loss of head and reduction in flow. 115 
Cause of the loss of flow. 116 
