The soil in the neighborhood of Pittsburgh is generally clayey, the calcareous rocks or stones of a brown color, consisting of much muddy clay. The soil between the two rivers on which Pittsburgh is built, is alluvial; stones rounded and worn by the rolling of torrents have even been found in the earth, dug up while sinking wells at a depth of more than 30 feet. The 9th of August, when I was ready to start, the conductor of the Boat on which I had embarked my baggage came to tell me that he was waiting for the Boats destined to convey the troops, especially as the Boat seemed too deeply laden for that Season when the Waters are low; there was an appearance of Rain. The 10th the river seems to be falling. The 11th, 12th and 13th we remained, awaiting the departure. The 13th three Boats arrived from the Illinois belonging to Mr. Vigo.[8] They were manned by about 30 French Canadian or Illinois oarsmen. A Frenchman who has resided in America for 14 years and whose business consists in shipping supplies of flour to New Orleans, told me that he would give me Letters for Illinois addressed to the Commandant of the Post of St Louis. He is at present settled in Pittsbourgh and his name is Audrain.[9] This Audrain is said to be in partnership with one Louisière or Delousière who was exiled from France for having been concerned in the plot to deliver Havre to the combined English and Spanish fleets. This Louisière is at present absent from Pittsburgh. There is another Frenchman residing in Pittsburgh, Mr Lucas de Pentareau, an excellent Democrat, now absent. He passes for an educated man with legal knowledge.[10] Pittsburgh is situated at the confluence of the two rivers, Monongahela and Allegany. These two rivers unite and form the Ohio or Belle Rivière. There are a great many more houses on the Monongahela river than on the Allegany. The number of houses is about 250 and it increases considerably every year. The ditches are still to be seen that served as the entrenchment of the Fort built by the French and called Fort Duquesne. The English, since that time, had built another almost beside it at the angle formed by the junction of the two rivers. It was built of brick and the Americans are demolishing it to use the bricks in building the houses that are being erected every day at Fort Pitt.[11] The Americans have a Fort of Palisades situated behind the town on the bank of the Allegany River; it serves as a Depot for the arrival of the troops that are being sent against the Savages and as a Magazine for the Munitions sent there from Philadelphia.[12] Wednesday the 14th of August, started from Pittsbourgh and slept at a distance of two miles only on the point of a small island on which I found _Acer negundo_, _rubrum_, _saccharum_; _Evonimus capsulis glabris_.[13]