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Dear Sir, London, February 8th, 1821. It may perhaps be interesting to the Royal Society to be informed, that on Sunday evening, the 4th instant, I observed a luminous spot in the dark part of the moon, which I was inclined to ascribe to the eruption of a volcano. The telescope used was an excellent Newtonian of 61/4 inches aperture, with a power of 74. The moon was exactly two days old, and the evening so clear, that I was able to discern the general outlines in the dark part of her disk. Her western azimuth was about 70°, and her altitude about 10 degrees.

XI. Notice respecting a volcanic appearance in the moon in a letter addressed to the President