COLE I ORIGIN AND FORMATION OF WOLD DALES. 139 
Table A. 
Area of exposed chalk forming the Wolds = 420 square miles. Average 
rainfall = 27| inches. 
Analysis of springs gives 6*82 grains lime = 12*18 grains of carbonate 
of lime per gallon. Worked by the aid of Logarithms. 
L. 4840 square yards 
L. 9 square feet 
L. 144 square inches 
L. 27 1 rainfall 
L. 277*27 cubic inches 
3*6848454 
•9542425 
2-1583625 
1- 4393327 
8-2367831 
2- 4429029 
cubic inches per acre per 
annum. 
5'7938802 == gallons per acre per annum. 
L. 12-18 grains per gallon 1*0856473 
L. 7000 grains 3*8450980 
L. 112 lbs. 2*0492180 
6*8795275 = grains per acre per annum. 
5-8943160 
•9852115 = cwts. per acre per annum. 
Or 9*6652 cwts. per acre per annum chemically removed. 
But an allowance of jth must be deducted for the amount of rain 
intercepted by ponds, tanks, vegetation, evaporation, &c, the true 
quantity being about 7| cwts., instead of 9| cwts. 
Hence — 
L. 7*2489 cwts. per acre -8602721 
L. 640 square acres 2*8061800 
L. 420 square miles 2*6232493 
20 cwts. 
6*2897014 total cwts. per annum. 
1*3010300 
i.e., 97,425 tons 4*9886714 tons per annum. 
Removed from the chalk area of 420 square miles in chemical solution 
only. 
IO 
