Prof. Winchell estimates that the Mississippi River, has worn a gorge 100 feet deep, 8 miles long, back to the Falls of St. Anthony, in about 8,000 years. The whole thickness of the Nile sediment, 40 feet in one place, was deposited in about 13,000 years. Calculations by Southall and others from certain strata have fixed man’s first appearance on the earth at 8,000 years, in harmony with Scripture. LeConte, in his Geology, p. 19, says, “Making due allowance for all variations, it is probable that all land-surfaces are being cut down and lowered by rain and river erosion, at a rate of one foot every 5,000 years. At this rate, if we take the mean height of lands as 1200 feet, and there be no antagonistic agency at work raising the land, all lands would be cut down to the sea level and disappear in 6,000,000 years.” May we not from these data, judge approximately of the age of the world, and show by this proof also, that the world can not be at all as old as the evolution theory demands? If the surface of the earth will be worn down 1200 feet on an average in 6,000,000 years, would it not also be true that the surface has been worn down at least 1200 feet in the last 6,000,000 years? For the higher the surface, the more rapid the erosion. And if the earth is 8,302,210 years old, as Lord Kelvin computes, then at the same rate, it must have been worn down an average of 1660 feet,—38% more than remains. Is this not a fair estimate for the amount of erosion and the age of the world? How high must the land have averaged, if the world is even 60,000,000 years old? If this be true, how long would it have taken erosion in the past, to reduce the land to its present configuration,—the short period indicated by science, or the immensely long period required by evolution?