dion_ (Friburgi, 1530 [1531], p. 41).

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.

Matthaeus Silvaticus. _Pandectae Medicinae_ (Lugduni, 1541, cap. 446).

Hermolaus Barbarus. His work, _Hermolai Barbari Patritii Veneti et
Aqvileiensis patriarchae 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. Agrippae 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,
medecin de Theodose-le-Grand, dit que l'aimant, appele _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 _D