Albertus Magnus. _De Mineralibus et rebus metallicis_ (Venet., 1542, lib. ii., _de lapidibus preciosis_, p. 192). There is a reference to the loadstone {7} also in a work attributed falsely to Albertus, but now ascribed to Henricus de Saxonia, _De virtutibus herbarum, de virtutibus lapidum_, etc. (Rouen, 1500, and subsequent editions). An English version, _The Secrets of Albertus Magnus of the vertues of hearbs stones and certaine beasts_ was publisht in London in 1617. Matthæus Silvaticus. _Pandectæ Medicinæ_ (Lugduni, 1541, cap. 446). Hermolaus Barbarus. His work, _Hermolai Barbari Patritii Veneti et Aqvileiensis patriarchæ Corollarii Libri quinque ..._ Venet., 1516, is an early herbal. On p. 103 are to be found descriptions of _lapis gagatis_ and _lapis magnes_. The latter is mostly taken from Pliny, and mentions the alleged theamedes, and the myth of the floating statue. Camillus Leonardus. _Speculum Lapidum_ (Venet., 1502, fol. xxxviii.). An English translation, _The Mirror of Stones_, appeared in London in 1750. Cornelius Agrippa. _Henrici Cor. Agrippæ ab Nettesheym ... De Occulta Philosophia Libri Tres_ (Antv., 1531). The English version _Of the Vanitie and uncertaintie of Artes_ was publisht in London, 1569, and again later. Fallopius (Gabriellus). _G. F. de simplicibus medicamentis purgantibus tractatus_ (Venet., 1566). See also his _Tractatus de compositione medicamentorum_ (Venet., 1570). Johannes Langius. _Epistolarum medicinalium volumen tripartitum_ (Paris, 1589, p. 792). Cardinalis Cusanus (Nicolas Khrypffs, Cardinal de Cusa). _Nicolai Cusani de staticis experimentis dialogus_ (Argentorati, 1550). The English edition, entitled _The Idiot in four books_, is dated London, 1650. [9] PAGE 3, LINE 1. Page 2, line 42. _Marcellus_.--"Marcellus Empiricus, médecin de Théodose-le-Grand, dit que l'aimant, appelé _antiphyson_, attire et repousse le fer." (Klaproth, _Sur l'invention de la boussole_, 1834, p. 12.) The passage from Marcellus runs: "Magnetes lapis, qui antiphyson dicitur, qui ferrum trahit et abjicit, et magnetes lapis qui sanguinem emittit et ferrum ad se trahit, collo alligati aut circa caput dolori capitis medentur." (Marcellus, _de Medicamentis_: in the volume _Medici antiqui omnes, qui latinis literis morborum genera persecuti sunt_. Venet., 1547, p. 89.) [10] PAGE 3, LINE 11. Page 3, line 9. _Thomas Erastus_.--The work in question is _Dispvtationvm de Medicina nova Philippi Paracelsi, Pars Prima: in qua quæ de remediis svperstitiosis & Magicis curationibus ille prodidit, præcipuè examinantur à Thoma Erasto in Schola Heydebergensi, professore_. (Basiliæ, 1572. Parts 2 and 3 appeared the same year, and Part 4 in 1573.)