THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA.

artesian water at a comparatively shallow depth, the average being from 125 to 200 feet. Bordering Lakes Monroe and Jessup and the St. Johns River the wells are more shallow and terminate at a depth of from 66 to 85 feet.
The first flow in the wells at Sanford is encountered at a depth of from ioo to 125 feet, after drilling through a rock more or less hard and penetrating the characteristic "water rock" or the Vicksburg Limestone. In some instances a light flow is obtained abovethis harder rock immediately overlying the Vicksburg. When such is the case it seems the water comes from a quicksand or sometimes from a stratum of sand and shell. In order to get a sufficient and permanent flow, however, the boring is continued until the Vicksburg Limestone is reached.
In a well owned by Mr. L. E. Morrow, four miles south of San-. ford on the Sanford-Orlando public road and drilled by Mr. W. E Holmes in April, 191o, the Vicksburg Limestone was reached at a depth of 113 feet. The first flow was obtained at a depth of I Io feet, coming from a light yellow sand. The following is an approximate log of this well constructed from notes given by the driller and from a partial set of samples kindly saved by him:
Feet.
Surface soil ............................................o- 5
Y ellow sand ................................................. 5- 40
Shell and sand, water, no flow ................................. 40- 6o
Sand... ..............................................6o- 91
Shell and sand with sharks' teeth .............................. 91- 95
Dark blue rock with black phosphatic pebbles ................... 95-1oo
Very hard rockI.................. ....................00-Io
Light yellow sand ........................ ......................101- 13
Vicksburg Limestone ...................................113
The principal supply of water for the city of Sanford is drawn from Lake Ada about four miles southeast of the city. The soft Water from the lake is preferred to the hard sulphuretted artesian water. However, the city has four artesian wells, which serve as a source of supply when the lake is low. These wells are all four inches in diameter and are reported to have an average depth of 130 feet. Measurements in regard to the volume of flow of these wells could not be obtained.
Several flowing wells occur at Cameron City on Lake Jessup. about six miles southeast of Sanford. The wells here are of about the same depth of those in and near Sanford and good flows areobtained. The principal use of the water is for irrigating purposes.:

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