Ixxx NOTES. 



aux Antilles, p. 102 118), in 1842, gave 12,158 feet, nearly accordant with 

 the result (12,181 feet) of the second trigonometric measurement of Borda in 

 1776, which I was enabled to publish from the Manuscrit du De'pot de la 

 Marine. (Humboldt, Vby. aux Re'gions e'quinox. t. i. p. 116 and 275 287.) 

 Borda's first trigonometric measurement, executed jointly with Pingre in 1771, 

 gave, instead of 12,181 feet, only 11,139 feet. The cause of the error was in 

 the erroneous notation of an angle (33' instead of 53'), as was related to me by 

 Borda himself, to whose great personal kindness I was indebted for so much 

 useful advice before my voyage to the Orinoco. 



(**) p. 247. I follow Pentland's statement of 12,367 feet; the more so 

 because Sir James Ross (Voy. of Discovery in the Antarctic Regions, vol. i. 

 p. 216) gave, as an approximate result, 12,400 feet as the height of this vol- 

 cano, of which the smoke and flames were visible even in the daytime. 



( 336 ) p. 247. On Mount Argseus, which was first ascended and barome- 

 trically measured (at 12,705 feet) by Hamilton, see Pierre de Tchihatcheff, 

 Asie Mineure (1853), t. i. p. 441449 and 571. William J. Hamilton, in his 

 excellent work (Researches in Asia Minor), obtained, as a mean result from a 

 barometric measurement and some angles, 13,000 feet; but if, as according to 

 Ainsworth, the height of Kaisarich is 1000 feet less than it was assumed by 

 Hamilton, it is only 12,000 feet. Compare Hamilton, in the Transact, of the 

 Geol. Soc. vol. v. Pt. III. 1840, p. 596. To the south-east of Argaeus (Erd- 

 schisch -Dagh), in the great plain of Eregli, south of the village of Karabunar 

 and of the mountain-group of Karadsha-Dagh, there rise several very small 

 cones of eruption. One of these, provided with a crater, has a form wonderfully 

 resembling that of a ship, running out in front into the shape of a prow. This 

 crater is in a salt lake, on the way from Karabunar to Eregli, fully four miles 

 from the former. The hill bears the same name. (Tchihatcheff, t. i. p. 455 ; 

 William J. Hamilton, Researches in Asia Minor, vol. ii. p. 217.) 



(*") p. 247. The height given is, properly speaking, that of the grass- 

 green mountain lake, the Laguna Verde, on the margin of which the Solfatara 

 examined by Boussingault is found. (Acosta, Viajes cientificos los Andes 

 ecuatoriales, 1849, p. 75.) 



( 3M ) p. 247. Boussingault reached the crater, and measured the height 

 barometrically ; it agrees very nearly with that which I stated by estimation, 

 twenty-three years earlier, on my journey from Popayan to Quito. 



(**) p. 247. Few volcanoes have had their height so over-estimated as 

 Mauna-roa. We have seen its supposed height gradually diminish from 

 18,400 feet (stated in Captain Cook's third voyage) to 16,482 feet in King's, 

 and 16,613 feet in Marchand's measurement, to 13,758 feet according to Wilkes, 





