The other Example or Instance was, Where an Acre, Part of a Field, was, by a Fancy, drilled with St. Foin in single Rows, about Thirty-three Inches asunder, but was never hoed: After Seven Years it was plowed up with the rest of the Field cross the Rows, and sown with Oats upon the Back Three Months after plowing. These Rows were as visible in the Oats, as if the St. Foin had been still remaining there: The Oats in the Rows where the St. Foin had been, looked of a deep green flourishing Colour, at first coming up, and until they were about half a Foot high, and the Spaces between them looked yellowish; but afterwards the Difference of their Colour disappeared, all the Crop being very good. Upon this I imputed it to the Rotting of the Roots, which by their Singleness were very large; and when the different Colours disappeared, I suppose the Roots of all the Oats had reached to the Benefit of the rotted Roots, which might also be then spread farther into the Spaces; and I doubt not but that the Rotting of Broad Clover-roots has the same Effect as of St. Foin, for manuring of Land, especially when the Roots are large. Some have objected against this Opinion, and say the Effect was rather to be imputed to the Rows of St. Foin shadowing the Earth under them, or else from their keeping the Earth under them free from Couch-grass, of which the Intervals were full: But I think it more probable, that the Couch-grass, having very long horizontal Roots, might draw Nourishment from the Earth under the Rows, and from the Intervals equally. And as to the Shadow of the Rows, tho’, for the First and Second Years, the St. Foin Plants were very large; yet, being afterwards, for Five or Six Years, until plowed up, constantly fed by Cattle, and being more sweet, was eaten very low, whilst the Couch-grass remained intire in the Intervals, and shadowed them more than the Earth of the Rows was shadowed by the St. Foin: Besides, the rotten Turneps, which were freed from both these Objections, had the same Effect on the Barley, as the St. Foin had on the Oats. The under Earth, in some time, is replenished by what the Rains leave, when they sink through it; and then Tap-rooted Plants may be there nourished again, tho’ the upper Earth be drained by the Corn; so that no Change is so beneficial, as that betwixt Tap-rooted Plants, and those which have only horizontal ones. The former are provided for by Rains, though not so speedily as the latter are by Tillage and Hoeing. Pastures require no Change of Herbs; because they have annually the same Supply of Food from the Dunging of Cattle that feed on them, and from the Benefit of the Atmosphere.