"... Unde cuspidem trahi a tanta mole terrena, quæ supereminet non absurde putavit Gullielmus Gilbertus, et in eo meridiano respicere recta polum, cave putes observatorem errasse. Est Vir accuratissimus, et interfuit omnibus observationibus, quas plures olim fecimus, et aliquas in sui gratiam, et cum arcubus vertici cupreo innitentibus, et cum innatantibus aquæ, et cum brevibus, et cum longis, quibus modis omnibus et Hierapoli usus suit." Sarpi had correspondence with Gilbert, Bacon, Grotius, and Casaubon. He also wrote on magnetism and other topics _in materia di Fisica_, but these writings have perisht. He appears to have been the first to recognize that fire destroyed the magnetic properties. (See _Fra Paolo Sarpi, the greatest of the Venetians_ by the Rev. Alexander Robertson, London, 1894; see also the notice of Sarpi in Park Benjamin's _Intellectual Rise in Electricity_.) [33] PAGE 6, LINE 7. Page 6, line 11.: _R. M. Paulus Venetus_. See preceding note. [34] PAGE 6, LINE 21. Page 6, line 28.: _Franciscus Rueus_.--Francois de la Rue, author of _De Gemmis Aliquot_ ... (Paris, 1547). Amongst other fables narrated by Rueus is that if a magnet is hung on a balance, when a piece of iron is attracted and adheres to the magnet, it adds nothing to the weight! [35] PAGE 6, LINE 25. Page 6, line 33.: _Serapio_.--This account of the magnetic mountains will be found in an early pharmacology printed in 1531 (Argentorati, G. Ulricher Andlenus), with the title "In hoc volumine continetur insignium medicorum Joan. Serapionis Arabis de Simplicibus Medicinis opus præclarum et ingens, Averrois Arabis de eisdem liber eximius, Rasis filius Zachariæ de eisdem opusculum perutile." It was edited by Otho Brunsels. Achilles P. Gasser, in his Appendix to the Augsburg edition of Peregrinus, gives a reference to Serapio Mauritanus, parte 2, cap. 394, libri _de medicinis compositis._ [36] PAGE 6, LINE 30. Page 6, line 39.: _Olaus Magnus_. See note to p. 5. [37] PAGE 6, LINE 34. Page 6, line 44.: _Hali Abas_.--A reference is given in Gasser's (1558) edition of Peregrinus to Haliabbas Arabs, lib. 2, _practicæ_ cap. 45, _Regalis Dispositionis Medicinæ_. The passage to which Gilbert refers is found in the volume _Liber totius medicinæ necessaria c[=o]tinens ... quem Haly filius Abbas ... edidit ... et a Stephano ex arabica lingua reductus_. (Lugd., 1523, 4to.) Liber Primus. Practice, Cap xlv. _de speciebus lapidum_, § 466. "Lapis magnetes filis e [=v]tute sadenego: & aiunt q[=m] si teneat^r in manu mitigat [=q] sunt in pedib^s ipis dolores ac spasm[=u]." Mr. A. G. Ellis identifies the noun _sadenegum_ as a Latin corruption of the Arabic name of hæmatite, _shâdanaj_. [38] PAGE 6, LINE 36. Page 6, line 46.: _Pictorius_.--His poem was publisht at Basel, 1567. See also note on Marbodæus, p. 7, line 20, below.