184 FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
COCOA.
The number of artesian wells in and around Cocoa renders it impossible to specifically mention more than a few representative ones. The artesian wells in this section terminate at a medium depth and are sunk without encountering great difficulty in drilling, thus making the cost comparatively slight. The wells terminate in the Vicksburg Limestone, as indicated by the mixed samples of drillings from the well of H. Bradford one mile southwest of Cocoa. The water is reported in some instances to contain a trace of salt but only in a very few cases was it found to be injurious to vegetation.
The well of 0. K. Key was sunk by the owner in 19o8." It is a three-inch well and has a depth of 202 feet. The well is cased 140 feet. The pressure of the well as indicated by the pressure gauge. March io, 191o, was ten pounds, or a head of 23.1 feet above the surface. The elevation of the well above the level of the water in the Indian River as shown by barometric readings is 15 feet, thus giving the well a total head of 38.1 feet above the water level in the river. The water has a slight trace of salt and is impregnated with hydrogen sulphide gas. 
About one-fourth mile southwest of the city postoffice is the well of the Cocoa Ice Company. This well is reported to have been drilled in I888. It is a four-inch well, 325 feet deep and cased about 125 feet. The pressure of this well in i9o8 was reported to be twelve and one quarter pounds. This pressure would give the well a head of 28.2 feet above the surface. The estimated surface elevation is about i1o feet above the river, making a total head of 38.2 feet above the level of the water in Indian River.
An artesian well one mile southeast of Cocoa was completed in February, i9io. This well was drilled by J. A. Coward and is owned by H. Bradford. It is three inches in diameter, 190 feet deep and is cased to a depth of 8o feet. A mixed sample of the drillings taken after the completion of the well indicates that the Vicksburg Limestone was encountered. The exact depth at whicii this limestone was reached could not be learned. The volume of flow as measured March io, 19io, was 6o gallons per minute and the pressure as indicated by the pressure gauge on the same date was five pounds or a pressure sufficient to cause the water to rise 11.5 feet above the surface. The elevation of the well above the level of the water in Indian River as shown by barometric read ings is 20 feet. This elevation together with a head of 11.5 feet above the surface gives the well a total head of 31.5. feet above the river level. The water is the characteristic sulphur water cormmon to most of the artesian wells of the State.