In the Addendum to the Life of Sir William Rowan Hamilton by Robert Perceval Graves, the date of Hamilton's discovery of the quaternions is wrongly printed as the 13th of October (of the year 1843). This would seem to be a typographical error. The quaternions were discovered by Hamilton on the 16th of October of that year, and there is copious evidence for this fact. This error is also present in the letter printed in the Athenæum (Athenæum, no. 3308 (1891) pp. 380--381) quoted in the Addendum to the Life of Sir William Rowan Hamilton.
David R. Wilkins
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