CXX11 NOTES. 



ference of one degree of geographical latitude corresponds very nearly to 0'5 

 of the Centigrade thermometer (0'9 Fahr.), but that in the system of tem- 

 peratures on the American coast from Boston to Charlestown, the same dif- 

 ference of latitude corresponds to 0'9 Centigrade (1'62 Fahr.) ; Asie Cen- 

 trale, T. iii. p. 229. 



C 532 ) p. 332. Kosmos, Bd. ii. S. 402, Antn. 6 (Eng. ed. p. xxvii. Note 146). 



(s 33 ) p. 332. Laplace, Expos, du Systeme du Monde (Seme ed.) p. 303, 

 345, 403, 406, and 408 ; the same in the Connaissance des terns pour 1811, 

 p. 386 ; Biot, Traite elem. d'Astr. physique, T. i. p. 61, T. iv. p. 9099, 

 and 614623. 



( 534 ) p. 333. Garcilaso, Comment. Reales, Parte i. lib. ii. cap. 2226 ; 

 Prescott, Hist, of the Conquest of Peru, Vol. i. p. 126. The Mexicans had 

 among their twenty hieroglyphic signs of days, one which they held in par- 

 ticular ho nour, called Ollin-tonatiuh, or "that of the four motions of the 

 Sun," and which was prefixed to the great cycle renewed every 52 = 4 x 13 

 years, and had reference to the Sun's path (expressed hieroglyphically by foot- 

 steps), intersecting the solstices and equinoxes. In the finely painted Aztec 

 manuscript, formerly preserved in the Villa of Cardinal Borgia at Veletri, and 

 from which I have borrowed much important information, there is the re- 

 markable astrological sign of a Cross, having written near it signs of days 

 which would designate truly the passages of the Sun through the Zenith of the 

 city of Mexico (Tenochtitlan), the Equator, and the Solstices, if the points 

 (round disks), appended to the signs of days on account of the periodical 

 series were equally complete in all the three passages spoken of. (Humboldt, 

 Vues des Cordilleres, Pl.xxxvii. No. 8, p. 164, 189, and 237). Nezahnalpilli, 

 King of Tezcuco, who was passionately devoted to the observation of the stars, 

 had erected a building which Torquemada somewhat boldly terms an Astro- 

 nomical Observatory, and of which the ruins were still seen by him. (Mo- 

 narquia Indiana, lib. ii. cap. 64.) In the Raccolta di Mendoza, we see the 

 representation of a priest observing the stars ; as is expressed by a dotted 

 line going from his eye to the observed star (Vues des Cordilleres, PI. Iviii. 

 No. 8, p. 289.) 



( 535 ) p. 335. John Herschel, on the astronomical causes which may influ- 

 ence geological phenomena, in the Transact, of the Geological Society of 

 London, 2d Ser. Vol. iii. P. i. p. 298 : the same, in his Treatise of Astro- 

 nomy, 1833 (Cab. Cyclop. Vol. xliii.) 315. 



C* 36 ) p. 336. Arago, in the Annuaire pour 1834, p. 199. 



( 83? ) p. 336. " II s'ensuit (du theoreme du a Lambert) que la quantite de 



