not necessary for its object, and running foul of something of which you were not apprized. A malignant fever has been generated in the filth of Water street, which gives great alarm. About 70 people had died of it two days ago, and as many more were ill of it. It has now got into most parts of the city, and is considerably infectious. At first 3 out of 4 died, now about 1 out of 3. It comes on with a pain in the head, sick stomach, then a little chill, fever, black vomiting and stools, and death from the 2d to the 8th day. Everybody who can, is flying from the city, and the panic of the country people is likely to add famine to disease. Though becoming less mortal, it is still spreading, and the heat of the weather is very unpropitious. I have withdrawn my daughter from the city, but am obliged to go to it every day myself. My threshing machine has arrived at New York. Mr. Pinckney writes me word that the original from which this model is copied, threshes 150 bushels of wheat in 8 hours, with 6 horses and 5 men. It may be moved either by water or horses. Fortunately the workman who made it (a millwright) is come in the same vessel to settle in America. I have written to persuade him to go on immediately to Richmond, offering him the use of my model to exhibit, and to give him letters to get him into immediate employ in making them. I expect an answer before I write to you again. I understand that the model is made mostly in brass, and in the simple form in which it was first ordered, to be worked by horses. It was to have cost 5 guineas, but Mr. Pinckney having afterwards directed it to be accommodated to water movement also, it has made it more complicated, and costs 13 guineas. It will thresh any grain from the Windsor bean down to the smallest. Adieu. TO MR. GORE. PHILADELPHIA, September 2, 1793.