Much of his energy in 1784-85 was devoted to rebuilding his house and improving his grounds, and to his trip to his Ohio lands--all of which are described elsewhere. No diary exists for 1784 except that of the trip to the Ohio, but from the diary of 1785 we learn that he found time to experiment with plaster of Paris and powdered stone as fertilizers, to sow clover, orchard grass, guinea grass and peas and to borrow a scow with which to raise rich mud from the bed of the Potomac. The growing poverty of his soil, in fact, was a subject to which he gave much attention. He made use of manure when possible, but the supply of this was limited and commercial fertilizers were unknown. As already indicated, he was beginning the use of clover and other grasses, but he was anxious to build up the soil more rapidly and the Potomac muck seemed to him a possible answer to the problem. There was, as he said, "an inexhaustible fund" of it, but the task of getting it on the land was a heavy one. Having heard of a horse-power dredge called the _Hippopotamus_ that was in use on the Delaware River, he made inquiries concerning it but feared that it would not serve his purpose, as he would have to go from one hundred to eight hundred or a thousand yards from high water-mark for the mud--too far out for a horse to be available. Mechanical difficulties and the cost of getting up the mud proved too great for him--as they have proved too great even down to the present--but he never gave up the idea and from time to time tried experiments with small plots of ground that had been covered with the mud. His enthusiasm on the subject was so great that Noah Webster, of dictionary fame, who visited him in this period, says that the standing toast at Mount Vernon was "Success to the mud!" Every scientific agriculturist knows that erosion is one of the chief causes of loss in soil fertility and that in the basins and deltas of streams and rivers there is going to waste enough muck to make all of our land rich. But the cost of getting this fertility back to the soil has thus far proved too great for us to undertake the task of restoration. It is conceivable, however, that the time may come when we shall undertake the work in earnest and then the dream of Washington will be realized. The spring and summer of 1785 proved excessively dry, and the crops suffered, as they always do in times of drought. The wheat yield was poor and chinch bugs attacked the corn in such myriads that our Farmer found "hundreds of them & their young under the blades and at the lower joints of the Stock." By the middle of August "Nature had put on a melancholy look." The corn was "_fired_ in most places to the Ear, with little appearance of yielding if Rain should now come & a certainty of making nothing if it did not."