THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA. 
189 
Constituents. Parts per million. 
Silica (Si02) . 12. 
Chlorine (Cl) . 642. 
Sulphates (SO4) 178. 
Phosphates (PO4) . 0. 
Carbonates (CO3) . o. 
Bicarbonates (HCO3) . 149- 
Sodium and Potassium (Na & K)...... 309. 
Magnesium (Mg) . 63. 
Calcium (Ca) . 132- 
Iron and Alumina (Fe & Al) . 3. 
Loss on ignition . 370. 
Total dissolved solids . 1,710. 
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 i 6 j 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 i 6 j 4 pounds and at 
Melbourne Beach t pounds. No measurements of the pressure 
of the wells north of Lotus were obtained. 
MICCO. 
The wells at Micco have for the most part been drilled a num¬ 
ber of years and for this reason no satisfactory records could be 
obtained. The principal use of the water is for irrigating pur¬ 
poses. One well drilled in 1908 for Peter Bertleson by J. L. Mob¬ 
ley 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 oil 
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 well are the principal source of domestic water supply, as 
well as being used for irrigating purposes. In a few instances the 
artesian wells are used for power purposes, such as for generating 
electricity by means of a water turbine. A ten-inch well drilled in 
1893 an d now owned by Mr. G. M. Houston, about one and one-half 
