Darwin, Mr. Charles, on geological time, [67]

Denudation, age of the globe as represented by, [63], [64]

„ average rate of whole globe, [44]

„ evidence from faults as to rate of, [53]

„ Dr. A. Geikie on rate of, [41]

„ glacial epochs in relation to, [46], [47]

„ in Colorado, [58]

„ in past ages not much greater than at present, [44]

„ method employed to estimate its rate, [39], [47]

„ Mr. A. R. Wallace’s method of estimating its rate, [51]