WATER SUPPLY OP PASTERN AND SOUTHERN FLORIDA. 241 
Sulphates (SO 4 ) . 178 
Phosphates (PO 4 ) . 0 
Carbonate's (CO 3 ) . 0 
Bicarbonates (HCO 3 ) . 149 
Sodium and potassium (Na and K). 309 
Magnesium (Mg) . 03 
Calcium (Ca) . 132 
Iron and alumina (Fe and Al) . ,... 3 
Loss on ignition . 370 
Total dissolved solids ... 1710 
At Tropic Mrs. John W. Merrill has two artesian wells, two 
and three inches respectively. These wells were drilled about 
1885. The depth was not learned. The gauge on the two-inch 
well, March 12, 1910, indicated a pressure of 16^4 pounds, or a 
head of 38.1 feet above the surface, or about 48 feet above the 
water level in Indian River. The wells are used for general 
purposes and give an excellent flow of sulphur water. 
From the records obtained it appears that the pressure of the 
wells on the island increases in passing from north to south. At 
Lotus the pressure was 16 pounds; at Tropic 16J4 pounds, and 
at Melbourne Beach 17 J4 pounds. No measurements of the pres¬ 
sure of the wells north of Lotus were obtained. 
MICCO. 
The wells at Micco have, for the most part, been drilled a 
number of years and, for this reason, no satisfactory records could 
be obtained. The principal use of the water is for irrigating 
purposes. One well, drilled in 1908 for Peter Bertleson by J. L. 
Mobley, was never completed. The well is 3 inches in diameter 
and is cased 180 feet. At a depth of 300 feet the drill was broken 
off and was never recovered. A flow coming just over the top 
of the casing was obtained at this depth. 
ROCKLEDGE. 
The Rockledge wells vary in depth from 150 to 480 feet. These 
wells are the principal source of domestic water supply, as well as 
being used for irrigating purposes. In a few instances the artesian 
