Note 3 — Chapter IX · SOO-HO-TO. LEGEND OF BUDDHA.
James Legge translation
(3) The Chinese character is {.}, “formerly,” and is often, as in the first sentence of the narrative, simply equivalent to that adverb. At other times it means, as here, “in a former age,” some pre-existent state in the time of a former birth. The incident related is “a Jataka story.”