Tymme (J.)--Nature’s Closet Opened. 4to. Lond., 1612. Ulstadii (P.)--Cœlum Philosophorum. 12mo. Lugd., 1553. Untzerus (M.)--Anatomia Mercurii. 4to. Hale Sax., 1620. Urbigero (Baro., _adept_)--Aphorisms. 12mo. Lond., 1690. Vallensis (R.)--De Veritate et Antiquitate Artis Chemicæ. 16mo. Par., 1651. Valentine (Basil, _adept_)--Last Will, Practica, Twelve Keys, Manual, Natural and Supernatural Things, Microcosm, &c. 8vo. Lond., 1671. ---- Triumphal Chariot of Antimony. 8vo. 1656. ---- Scripta Chimica. 8vo. Hamburgi, 1700. Vallerlis (V.)--Lulliam Explicano. 4to. August., 1589. Vanderlinden--De Scriptis Medecis. 4to. Norim., 1686. Vanner (T.)--Way to Long Life. 4to. Lond., 1623. Vannucio Pyrotecnia della Minere. 4to. Venet., 1540. Vargas (B. P.)--De Re Metallica. 8vo. Madrid, 1569. Vigam of Verona--Medulla Chymiæ. Lond., 1683. Vigenerus (B.)--Of True Fire and Salt. Lond., 1649. Vigani (J. A.)--Medulla Chymiæ. Lug. Bat., 1693. Villanova (Arnoldus de)--Opera Omnia--Conversion of Metals, Rosary, Speculum, Questions, Flos Florum, &c. Fol. Lugd., 1520. Villanovani (Petri), _compiler_--Speculum. Duæ, 1626. Vittestein--De Quinta Essentia. 8vo. Basil, 1582. Vogelii (Ewal.)--De Lapide Physici. Colon., 1575. Vonderbeet (D.)--Experimenta. Ferrariæ, 1688. Wallerus--Chemia Physica. 8vo. Lond. Water--The Water Stone of the Wise. 8vo. Lond., 1659. Webster’s History of Metals. 4to. Lond., 1671. Wecker (Dr, of Basle)--Secrets. 8vo. Lyons, 1643. Weidenfeld (J. J.)--Secrets of the Adepts. 4to. Lond., 1685. Weidnerus (J.)--De Arte Chimica. 4to. Basil, 1610. Wickffbain (J. P.)--Salamandra. Norimb., 1683. Williams (W.)--Occult Physics. 8vo. Lond., 1660. Willis (T.)--Theophisical Alchemy. 8vo. Lond., 1616. ---- Opera Omnia Medicin. 2 v. Lugd., 1681. Wilson (G.)--Three Hundred Unknown Experiments. Lond., 1699. Wirdig (Sebas.)--Medicina Spiritum. Norimberg, 1675. Wittestein (C.)--De Quinta Essentia. 8vo. Basil, 1583. Wittichius (J.)--De Lapide Philos. 8vo. Francof., 1625. Zacharia--Clavis Spagirica. 4to. Venet., 1611. Zacharii (D., _adept_)--La Vraie Philosophie des Metaux. 8vo. Anvers., 1567. ---- De Chimico Miracule. 8vo. Basil, 1583. Zadith--Antiquissimi Philos. 8vo. Argent., 1566. Zelator (J.)--Alchemistici. 8vo. Basil, 1606. * * * * * _Note._--The titles of some of the treatises enumerated above have been mutilated by the original bibliographers, and owing to the extreme rarity of most alchemical books, it has been impossible to correct all errors. APPENDIX. I.