Unpublished letter, regarding astronomical observations from Australia from Tho [Thomas] Brisbane to Sir Humphry Davy Brisbane writes that he is sending further astronomical observations taken in Australia, some taken by [Karl Ludwig Christian] Rumker as well. Brisbane states that he is unsure whether the previous observations had been received by Davy. He mentions that the observations include a comet, a solstice, and the passage of Mercury. Subject: Astronomy / Meteorology Written by Brisbane in G [Government] House, Parramatta, N S [New South] Wales, [Australia]. 18 January 1823