THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA. The Vicksburg is-very characteristic in appearance and structure, and when once seen is not likely to be mistaken for any other formation in this part of the State. The first one or two hundred feet is of light color. This limestone as seen in well samples has a graunlar appearance and may contain many small shells. This phase of the limestone is frequently spoken of by the drillers as the "coral" formation. As a matter of fact, however, the formation contains relatively few corals. After passing through this limestone one or two hundred feet a more compact limestone is encountered. This part of the formation often has a slightly pinkish cast, the rock being very hard, and the drilling difficult. While these are the general characteristics of the Vicksburg, yet its texture is not uniform. Hard layers usually alternate with soft layers, the water supply as a rule increasing as each hard layer is penetrated. Not infrequently masses of flint are found imbedded in the limestone which in some instances have given much difficulty in drilling. While, as already stated, the, Vicksburg limestones dip on passing to the east approaching the Atlantic, yet the dip is not uniform and the depth at which it is encountered varies from place to place. In the wells at Jacksonville the Vicksburg is reached at a depth of from 500 to 525 feet. At Callahan and at Fernandina in Nassau County, although no samples have been obtained, the Vicksburg is believed, from well records, to be reached at about the same depth as at Jacksonville. Along the St. Johns River the Vicksburg maintains a similar depth for some distance. At Ortega, seven miles south of Jacksonville, the limestone was reached at a depth of about 500 feet. At Magnolia Springs, and Green Cove Springs, thirty miles soutl of Jacksonville, and on Black Creek, while no well samples were obtained, the Vicksburg is believed from well records to occur at a depth of from 325 to 400 feet. Passing to the south the Vicksburg lies nearer the surface. Samples of drillings from wells at St. Augustine and at Hastings in St. Johns iCounty and at Orange Mills in Putnam County show that the Vicksburg in this section lies at a depth of 130 to 225 feet, the greater depth being at St. Augustine and the minimum depth at Orange Mills. Passing to the south the Vicksburg lies, so far as well records indicate, at a fairly uniform level for a dis7. tance of I5o miles. At Sanford, 75 miles south of Orange Mills the Vicksburg is reached at a depth of from ii3 to 125 feet.. At Daytona, although samples are lacking, the depth of this; formation is believed, judging from well records, not to ex-.