CXX1V NOTES. 



ista succini credita attractio, a singular! aliqua proprietate substantive, aut 

 familiaritate assurgit ; cum in plnribus aliis corporibus eundem effectum, 

 majori industria inveuimus, et omnia etiani corpora cujusmodicunque pro- 

 prietatis, ab omnibus illiis alliciuntur." (De Magnete, p. 50, 51, 60, and 65.) 

 Gilbert's principal labours appear to belong to the interval from 1590 to 1600. 

 Whevvell justly assigns him an important place among those whom he terms 

 " practical Reformers of the physical sciences." Gilbert was surgeon to 

 Queen Elizabeth and James I. and died in 1603. A second work, entitled 

 " De Mundo nostro sublunari Philosophia Nova," was published after his 

 death. 



P) p. 341. Brewster, Life of Newton, p. 307. 



(^) p. 344. Rey, strictly speaking, only mentions the access of air to 

 the oxides ; he 'did not know that the oxides themselves (which were then 

 called metallic calxes) are only combinations of metals and air. According 

 to him, the air makes " the calx heavier, as sand increases in weight when 

 water hangs about it." The calx is susceptible of being saturated with air. 

 " L'air espaissi s'attache a la chaux, ainsi le poids augmente du commence- 

 ment jusqu'a la fin : mais quand tout en est affuble, elle u'en S9auroit prendie 

 d'avantage. Ne continuez plus votre calcination soubs cet espoir, vous per- 

 driez vostre peine." Rey's work thus contains the first approximation to the 

 better explanation of a phenomenon, the more complete understanding of 

 which was afterwards influential in reforming the whole of chemistry. See 

 Kopp, Gesch. der Chemie, Th. iii. S. 131 133. (Compare also in the same 

 work, Th. i. S. 116127, and Th. iii. S. 119138, as well as S. 175 

 195.) 



C 31 ) p. 345. Priestley's last complaint of that which " Lavoisier is 

 deemed to have appropriated to himself," makes itself heard in his little 

 memoir entitled, "The Doctrine of Phlogiston established," 1800, p. 43. 



t 532 ) p. 346. Sir John Herschel, Discourse on the Study of Natural Phi- 

 losophy, p. 116. 



t 533 ) p. 346. Humboldt, Essai geognostique sur le Gisement des Roches 

 dans les deux Hemispheres, 1823, p. 38. 



(^ p. 347. Steno de Solido intra Solidum naturaliter contento, 1669, 

 p. 2, 17, 28, 63, and 69 (fig. 2025). 



t 535 ) p. 347. Venturi, Essai sur les Ouvrages physico-mathe'matiques de 

 Leonard de Vinci, 1797, S. 5, No. 124. 



( w6 ) p. 347. Agostino Scilla, La vana Speculazione disiugannata dal 

 Senso, Nap. 1670, Tab. xii. fig. 1. Compare Joh. Muller, Bericht iiber die 



