On Monday, Sept. 14th, I took staff and set out for another week- stage of my walk, or from Perth to Inverness. Crossed the Tay and proceeded northward up the east side of that fertile river. Fertile may sound at first a singular qualification for a broad, rapid stream running down out of the mountains and widening into a bay or firth at its mouth. But it may be applied in the best sense of production to the Tay; and not only that, but other terms known to practical agriculture. Up to the present moment, no river in the world has been cultivated with more science and success. None has been sown so thickly with seed-vitalities or produced more valuable crops of aquatic life. Here salmon are hatched by hand and folded and herded with a shepherd's care. Here pisciculture, or, to use a far better and more euphonious word, fish-farming, is carried to the highest perfection in Great Britain. It is a tillage that must hereafter take its place with agriculture as a great and honored industry. 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. Then the whole distance would contain the space of 4,000 square acres, and the annual rent for fishing would amount to over 3 pounds 13s. per acre. This would make every fish-bearing acre of the river worth 100 pounds, calculated on the land basis of interest or rent.