[190] PAGE 111, LINE 3. Page 111, line 3. _Meminerunt Chatochitis lapis Plinius, atque Iulius Solinus._--The passage in Pliny (English version of 1601, book xxxvii., ch. x., p. 625) runs: "Catochitis is a stone proper unto the Island Corsica: in bignesse it exceedeth ordinarie pretious stones: a wonderfull stone, if all be true that is reported thereof, and namely, That if a man lay his hand thereon, it will hold it fast in manner of a glewie gum." [191] PAGE 111, LINE 7. Page 111, line 7. _Sagda vel Sagdo._--Albertus Magnus in _De Mineralibus_ (Venet., 1542, p. 202) says: "Sarda quem alij dicunt Sardo lapis est qui se habet ad tabulas ligni sicut magnes ad ferr[=u], et ideo adhæret ita fortiter tabulis nauium quòd euelli n[=o] possit, nisi abscindatur cum ipso ea pars tabulæ cui inhæserit, est aut[=e] in colore purissimus nitens." And Pliny (_op. citat._, p. 629): "Sagda is a stone, which the Chaldeans find sticking to ships, and they say it is greene as Porrets or Leekes." [192] PAGE 111, LINE 8. Page 111, line 8. _Euace._--Evax, king of the Arabs, is said to have written to Nero a treatise on the names, colours, and properties of stones. See the note on Marbodæus, p. 7, line 20. [193] PAGE 113, LINE 14. Page 113, line 19. _repulsus sit._ The words read thus in all editions, but the sense requires _repulsa sint._ [194] PAGE 113, LINE 23. Page 113, line 29. _Electrica omnia alliciunt cuncta, nihil omninò fugant vnquam, aut propellunt._ This denial of electrical repulsion probably arose from the smallness of the pieces of electric material with which Gilbert worked. He could hardly have failed to notice it had he used large pieces of amber or of sealing-wax. Electrical repulsion was first observed by Nicolas Cabeus, _Philosophia Magnetica_, Ferrara, 1629; but first systematically announced by Otto von Guericke in his treatise _Experimenta Nova (ut vocantur) Magdeburgica, de Vacuo Spatio_ (Amstel., 1672). [195] PAGE 113, LINE 29. Page 113, line 37. _cùm de calore quid sit disputabimus._--The discussion of the nature of heat is to be found in Gilbert's _De Mundo nostro Sublunari_ (Amstel., 1651), lib. i., cap. xxvi., pp. 77-88. [196] PAGE 115, LINE 23. Page 115, line 23. _trium vel quatuor digitorum._--Here as in all other places in Gilbert, _digitus_ means a finger's breadth, so that three or four digits means a length of two or three inches, or from six to eight centimetres. [197] PAGE 117, LINE 26. Page 117, line 25. _ille Thebit Bencoræ trepidationis motus._ "Trepidation in the ancient Astronomy denotes a motion which in the Ptolemaic system was attributed to the firmament, in order to account for {51} several changes and motions observed in the axis of the world, and for which they could not account on any other principle." (Barlow's _Mathematical Dictionary_.)