John, the Dana passage appears at the very end of Ch. XV of the book, and was revised and shortened before the 1840 publication. Dana and some shipmates are visiting the forecastle of the "Lagoda" at San Diego. The full passage is as follows (p. 115):


"One of their first inquiries was for Father Taylor, the seamen's preacher in Boston. Then followed questions about people of a different character and less hon[ora]bl[e] walk than Father Taylor, whom my shipmate, who was an old sailor, could tell them more about than I could. With him they compared notes about Liverpool, Havre, Tybee Light, Boodle Alley, Collier's Reach, 'Round the corner Sally, and so forth, conversation which one must always hear in a ship's forecastle and which, bad as it is, is no worse, nor, indeed, more gross, than that of many well-dressed young gentlemen at their clubs."