$2.oo per foot. The larger wells range in proportion, a ten inch well costing about $3.50 per foot. The driller at these prices furnishes the casing.
INCREASED ,FLOW OF ARTESIAN WELLS WITH INCREASED DEPTH.
As a rule the amount of flow or yield of wells in eastern Florida increases with depth. To this rule there are doubtless exceptions since the amount of flow in all cases depends upon the variable structure of the rock through which the drill passes. As illustrations of increased flow with increased depth the following may be cited:
In the new city well at Jacksonville, well No. to of the city water supply, the first flow obtained was a light flow of 5 gallons per minute at a depth of 270 feet. At a depth of 498 feet the flow increased to I12 gallons per minute. Upon reaching the Vicksburg Limestone at a depth of 5 to feet the flow increased to 200 gallons per minute. The flow at the depth of 635 feet was found to be 5oo gallons per minute. At 900 feet the flow was about 900oo gallons per minute. At 98o feet, the full depth of the well, the flow was from i1,5oo to 2,00ooo gallons per minute. For the detailed measurements of flow on this well the Survey is indebted to the drillers, the Hughes Specialty Well Drilling Company of Charleston, South Carolina.
A like increase of flow is shown by the Ponce de Leon well in St. Johns County, the measurements of which were kept and have been kindly supplied by Messers McGuire anrid MacDonald, contractors. The first flow in this well of -o gallons per minute was obtained at a depth of 170 feet. At 177 feet the flow increased to 350 gallons per minute. At 410 feet the flow was 2083 gallons. At 520 feet the flow had increased to 4860 gallons. At IIio feet the flow was 6075 gallons. The well was continued to a total depth of 1440 feet. The record of the well however, contains no mention of increased flow below ItI Ito feet. While exact measurements like those given above are seldom made the drillers with few exceptions report increased flow with increased depth.
INCREASED HEAD WJTII INCREASED DEPTH.
Not only does the amount of flow of the water in this section of the State increase with increased depth, but the head or pressure or height above the ground to which the water will rise like-

THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA.

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