This would not meet the eye when the letter was doubled over in the usual way, and it was probably a note of the sender rather than of the recipient. Besides the letters received and filed at Philadelphia we have one or two fragments of a sort of register of expedition (cf. P. Lille I, 3) containing drafts of letters to be written by Zenon. P. S. I., 520 may perhaps be a fragment of the same kind.
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