NOT a Nichols first synthesis — escaline was described by George S. Grace in 1934 and again by Benington and colleagues in 1954. Nichols and Dyer prepared the 4-alkoxy mescaline homologue series (escaline, proscaline, isoproscaline) and showed serotonin-agonist potency tracks lipophilicity. The Wikipedia biography's phrasing on this point is misleading.
NOT his synthesis: first described by George S. Grace in 1934, later made by Benington (1954), Leminger (1972) and Nichols (1977). Shulgin's PiHKAL entry (#72) supplies the human dosage data the field relies on.