NOTES. CXX111 



si volge verso Oriente, sidovrebbesentircontinuamentennvento, checi ferisse, 

 spirando da Levante verso Ponente; e tale spiramento dovrebbe farsi piu sen- 

 sibile, dove la vertigine del globo fusse piu veloce : il che sarebbe ne i luogbi 

 piu remoti da i Poli, e vicini al cerchio massimo delk diurna conversione. 

 L'esperienza applaude molto a questo filosofico discorso, poiche ne gli ampi 

 mari sottoposti alia Zona torrida, dove anco 1* evaporazioni terrestri man- 

 cano (?) si sente una perpetua aura muovere da Oriente " 



( 524 ) p. 338. Brewster, in the Edinburgh Journal of Science, Vol. ii. 

 1825, p. 145. Sturm has described the Differential Thermometer in a little 

 work, entitled, Collegium experimentale curiosum, (Nuremberg, 1676,) p. 49. 

 On the Baconian law of the rotation of the wind, which Dove first extended to 

 both zones, and recognised in its intimate connection with the causes of all aerial 

 currents, see the detailed treatise of Muncke in the new edition of Gehler's 

 Physikal. Worterbuch, Bd. x. S. 20032019 and 20302035. 



( 525 ) p. 339. Antinori, p. 45, and even in the Saggi, p. 1719. 



( 526 ) p. 339. Venturi, Essai sur les ouvrages physico-mathematiques de 

 Leonard de Vinci, 1797, p. 28. 



( 527 ) p. 339. Bibliotheque universeUe de Geneve, T. xxvii. 1824, p. 120. 



( 528 ) p. 340. Gilbert de Magnete, lib. ii. cap. 24, p. 4671. In in- 

 terpreting the nomenclature employed he already said : " Electrica qua attra- 

 hit eadem ratione ut electrum, versorium non magneticum ex quovis metallo, 

 inserviens electricis experimentis." In the text itself we find it said ; " Mag- 

 netice ut ita dicam, vel electrice attrahere (vim illam electricam nobis placet 

 appellare . . . .) (p. 52); " effluvia electrica, attractiones electricse." He 

 neither employed the abstract expression electricitas, nor the barbarous term 

 magnetismus introduced in the 18th century. On the derivation of ijAc/crpoy, 

 the " attracter or drawer, and the drawing or attracting stone," from e\ 

 and \Kiv, already indicated in the Timseus of Plato, p. 80 c, and the proba- 

 ble transition through a harder \Krpov, see Buttmann, Mythologus, Bd. ii. 

 (1829), S. 357. Among the theoretical propositions put forward by Gilbert 

 (which are not always expressed with equal clearness), I select the following : 

 " Cum duo sint corporum genera, quse manifestis sensibus nostris motionibns 

 corpora allicere videntnr, Electrica et Magnetica; Electrica naturalibus ab 

 humore effluviis ; Magnetica formalibus efiicientiis seu potius primariis vigo- 



ribus, incitationes faciunt Facile est hominibus ingenio acutis, absque 



experimentis et usu rerum labi, et errare. Substantise proprietates aut fami- 

 liaritates, sunt generates nimis, nee tameu verse designates causse, atque, ut 

 ita dicam, verba qusedam sonant, re ipsk nihil in specie ostendunt. Neque 



