ENVELOPE #2 -- Dated Jan 12, unknown year. Care of Thos: Biddle & Co. 326 Walnut was not only their residence, but home to Alexander's father's legal practice company Thomas Biddle & Co which Alexander joined in 1848. ENVELOPE #3 -- Dated Feb 19, 1863 or 1868. ENVELOPE #4 -- Dated Feb, 186?
Please let me know if you have any questions.