If the cold, bald-headed mountains, the wild, stony reaches of poverty-stricken regions, moor, morass, steppe and prairie are made the pasturage of sheep innumerable, the thousands of rivers in both hemispheres will not be suffered to run to waste through another century.

The utilitarian genius of the present age will turn them into pasturage worth more per acre than the value of the richest land on their banks.

Just think of the pasturage of the Tay.

It rents for 14,000 pounds a year; and those who hire it must make it produce at least 50,000 pounds, or $240,000 annually.

Let us assume that the whole length of this salmon-pasturage is fifty miles, and its average width one-eighth of a mile.