Joty—An Estimate of the Geological Age of the Earth. 65 
APPENDIX I. 
To facilitate review of the numerical quantities adopted in the calculations 
involving the Age of the Earth, the chief data are here collected. 
Area of land (Murray and Wagner), : : . . 55,814,000 square miles. 
Ratio of oceanic to land-area, F ; ‘ 3 o Meliss il. 
Hence, oceanic area, . : : : 5 : . 141,767 x 10° square miles. 
Mean depth of ocean (Murray), .. : 5 : . 2076 fathoms = 2°393 miles. 
Bulk of ocean, : : ; 5 ; : . 889,248 x 103 miles. 
Mass of a cubic mile of sea-water, . : 5 ; ‘ 43 x 10® tons. 
Mass of ocean, ; : i ; F j : : 1:460 x 10}8 tons. 
Mass of NaCl in ocean, . : 0 : ‘ : . 989,782 x 10” tons. 
4 Na . E : ‘ ; j : . 15,627 x 10” tons. 
a Cl combined with Na in ocean, . j : . 24,155 x 10” tons. 
55 K,SO, in ocean, 5 F : : : ; 1260 x 101” tons. 
eS K 5 5 ; 5 ‘ : : : 565 x 10” tons. 
- MgCl, ,, ; : ‘ ; E ; : 5568 x 10! tons. 
% Cl combined with Mg in ocean, . : ; : 4161 x 10 tons. 
Annual river discharge into oceans, 6524 cubic miles. 
Mass of sodium in a cubic mile of river-water, : . 24,106 tons. 
Annual river supply of Na, . 0 : : 5 . 15,727 x 10* tons. 
Annual (calculated) Na,O discharge of rivers, : : 21 x 10’ tons. 
» » K,0 5% Sdn : , 7°3 x 107 tons. 
Estimated bulk of siliceous sedimentary detrital rock = layer 1:1 mile thick over land. 
Soda percentage of primitive rock, : : : : 3°61. 
Potash 0 - es ‘ ‘ : : 2°83. 
Mean soda percentage of sedimentaries, . : : : 1°47. 
», potash a ye : : ; F 2°49. 
