"As to the Plaster of Paris, which Mr. Binns so strongly recommends, it is singularly, that whilst it proves such a source of fertility to you, it is of little avail in any part of the British Islands, Kent alone excepted. I am thence inclined to conjecture, that its great advantage must arise from its attracting moisture from the atmosphere, of which we have in great abundance in these Kingdoms...."
But it is time to turn to Binns' own record of his work. How desperately poor the yield of grain had become in Loudoun is shown by his statement that some of his unplastered land yielded but five bushels of wheat to the acre and not more than three bushels of corn on a place so worn out, when he took it over in 1793, that his friends thought he "must starve on it." By 1798 he was getting from that farm 15-1/2 bushels of corn to the acre and the next year, on that corn land, had 27 bushels of heavy wheat per acre. In another place he notes: "I put a parcel of it" (plaster) "on some corn in the hill which produced about 22 bushels, the other part of the field yielding about 12 bushels to the acre."
As an interesting sidelight he indicates that tobacco was being grown around Leesburg at that time. In 1803, as he wrote his book, he expected a crop of 40 bushels of wheat per acre on his farms. And by way of summarizing his work
"There are several places on the Catocton Mountain, that some few years past the corn stalks, when the tops were taken off, were not above three feet high, and which would not produce more than two or three barrels of corn to the acre, and from 5 to 6 bushels of wheat; and perhaps not yield grass enough to the acre to feed a horse for two weeks after the harvest was taken off; but from the use of plaster will now produce from six to eight barrels of corn, and from twenty to twenty-five bushels of wheat per acre; the luxuriant growth of the white and red clover after harvest gives the fields which once looked like a barren waste of country, the appearance of a beautiful meadow."
"... These circumstances made me anxious to cleanse my stables, stockyards, cow-pens, hog-pens, wood-yards and ash-heaps by the first June. This rule I have always followed ever since I began to farm for myself, and can say that my family have never experienced an intermittent or remittent" (fever) "unless attacked with them from home first, and upon their return they have immediately left them. In my travels where ever I have discovered those kind of fevers, I have always observed either dirty, filthy stables, hog-pens or water standing in their cellars or ponds of water not far off; I have also observed those places most liable to dysentaries...."