en.wikipedia.org/wiki/John_Henry_Cox
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The voyage began on 26 Feb 1789 in London and ended in Canton on 1 Jan 1790. Mortimer gives no clue as to how he then returned to England, but we can guess that he probably paid for a berth home in an East India Company vessel. His narrative was published on 25 Mar 1791.
Cox’s motives for the trip are analysed in the article referenced above.
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