"We remained in New York City for a few days, and then removed to Mill Grove, on Pickering [Perkioming] Creek, in Pennsylvania, a tract of land owned by our fathers, and at that time thought to contain valuable minerals." [165] In the rich bottom-lands of the Ohio River basin the hackberry or sugarberry (_Celtis occidentals_) sometimes exceeds one hundred feet in height, and has a diameter of from four to five feet. [166] The population of the second city of Pennsylvania in 1800 was 1,565; in 1840, 4,768; and in 1910, after the annexation of Allegheny, 533,905. [167] Maria R. Audubon, _Audubon and his Journals_ (Bibl. No. 86), vol. i, p. 28. [168] See Appendix I, Document No. 11. [169] See Chapter XI, page 158. [170] When Audubon was returning with his wife and infant son from Pennsylvania to Kentucky in the autumn of 1810; see "The Ohio," _Ornithological Biography_ (Bibl. No. 2), vol. i, p. 29. [171] In 1800 the population of Louisville was 600, and in 1810 it had risen to 1,350; see Charles Cist, _Cincinnati in 1841_ (Cincinnati, 1841). [172] For this and the letter of Thomas Bakewell's uncle, William Bakewell, which follows later, I am indebted to Mr. Tom J. Rozier; see Note, Vol. I, p. 133, and for accompanying "Account Current" of Audubon & Rozier, Appendix I, Document No. 11. [173] See Note, Vol. I, p. 196. [174] The lead mine at "Mill Grove," which with the remaining Audubon and Rozier interests in the farm had been taken over by Dacosta's company in September, 1806. The failure of Dacosta followed in about a year after the date of this letter. [175] Victor Gifford Audubon, who was then nine months old. [176] See Vol. I, p. 153. [177] William Bakewell died at Philadelphia on March 6, of the same year, after suffering from the effects of a sunstroke, and was, eventually, buried at "Fatland Ford;" in 1822 his farm, originally of 800 acres, passed into the hands of Dr. William Wetherill. See Note, Vol. I, p. 99, and W. G. Bakewell, _Bakewell-Page-Campbell_ (Bibl. No. 200). [178] In a letter to Alexander Lawson, written from Pittsburgh, on February 22, 1810; see Elliott Coues, "Private Letters of Wilson, Ord, and Bonaparte," _Penn Monthly_, vol. x, pp. 443-455 (Philadelphia, 1879). [179] See Elliott Coues, _loc. cit._ [180] Letter to Alexander Lawson, dated at Lexington, April 4, 1810; see Grosart, _Poems and Literary Prose of Alexander Wilson_, vol. i, p. 189. [181] See Grosart, _Poems and Literary Prose of Alexander Wilson_, vol. i, p. xxiv. [182] For "The Shark, or Lang Mills Detected," a satire directed against William Sharp, a manufacturer of Paisley; Wilson was fined £12 13s. 6d. [183] See Bibliography, No. 43.