] NOTES. 



new views on this subject expressed by the great physicist Melloni, in a Memoir 

 read by him to the Royal Academy of Naples, in January 1853. (Esperienze 

 intorno al Magnetismo delle Rocche; Mem. I. sulla Polarita.) The old prejudice 

 which has prevailed so extensively, particularly in the Mediterranean; that by 

 rubbing a compass-needle with onions, or even by its being exposed to the exha- 

 lations of vinegar in which onions have been steeped, its directive force is less- 

 ened, and confusion in steering caused, is found mentioned in Procli Diadochi 

 Paraphrasis Ptolem. libri iv. de Siderum Affectionibus, 1635, p. 30. (Delambre, 

 Hist, de 1'Astronomie ancienne, t. ii. p. 545.) It is difficult to guess what may 

 have given occasion to this curious popular notion. 



C 225 ) p. 162. Kosmos, Bd. iii. S. 44 (English edition, p. 35). 



( 226 ) p. 162. Kosmos, Bd. i. S. 208210 (English edition, p. 189191). 



( 827 ) p. 163. Kosmos, Bd. iii. S. 48, 431, 503, and 508510 (English 

 edition, p. 39, 309, 360, 365367.) 



( S28 ) p. 164. Kosmos, Bd. i. S. 220 (English edition, p. 200201). 



(z 29 ) p. 165. Kosmos, Bd. i. S. 233 (English edition, p. 212). Compare 

 Bertrand-Geslin, Sur les Roches lance'es par le Volcan de Boue du Monte Zibio 

 pres du Bourg de Sassuolo, in Humboldt, Voyage aux Re'gions dquinoxiales du 

 Nouveau Continent (Relation historique), t. iii. p. 566. 



( 23 ) p. 165. Robert Mallet, in the Transactions of the Royal Irish Academy, 

 vol. xxi. (1848) p. 51 113 ; the same, First Report on the Facts of Earth- 

 quake Phenomena, in the Report of the Meeting of the British Association for 

 the Advancement of Science, held in 1850, p. 1 89 ; the same, in the Manual 

 of Scientific Inquiry for the Use of the British Navy, 1849, p. 196223 ; 

 William Hopkins, "On the Geological Theories of Elevation and Earthquakes," in 

 the Report of the Brit. Assoc. for 1847, p. 3392. I have availed myself in 

 several particulars of the strict criticism to which Mr. Mallet has submitted my 

 earlier works in his very valuable memoirs (Irish Trans, p. 99 101, and Report 

 of Meeting of the Brit. Assoc. held at Edinburgh, p. 209). 



( 231 )p. 165. Thomas Young, Lectures on Natural Philosophy, 1807, vol. i. 

 p. 717. 



( 232 ) p. 166. I follow the statistical statement communicated to me in 1802 

 by the Corregidor of Tacunga. It carried the loss to the number of from 30,000 

 to 34,000, but some twenty years later the number of those directly killed was 

 stated at a third less. 



( 833 ) p. 167. Kosmos, Bd. i. S. 221 (English edition, p. 201). 



( 234 ) p. 169. On this subject, and opposed to the supposition of molten " sub- 

 jacent fluid, confined in internal lakes" see Hopkins, Meeting of the Brit. Assoc. 

 in 1847, p. 57 j and on " the subterraneous lava tidal wave moving the solid 



