Narrative of the surveying voyages of his majesty's ships Adventure and Beagle (vol.2- Appendix): between the years 1826 and 1836 : describing their examination of the southern shores of South America, and the Beagles's circumnavigation of the globe

AFEENUIX. 301 No. 50. A few Observations on the Temperature of the Sea in latitude 27° 30' S. and longitude 41° E. ; on the loth May 183G.— (Six's self-registering Thermometer, Fahrenheit's Scale, used.) At the surface , ^ 75,6 At 200 fathoms below 58",5 At 5 fathoms below 74,5 300 • • 55,5 8 74,2 400 • • 52,5 18 74,0 420 .. 52,0 20 74,0 28 73,0 A few repeated • — 40 72,5 At 5 fathoms below 74,4 48 71,0 20 74,0 50 70,0 48 71,0 75 68,0 50 • 70,0 100 64,5 100 • • 64,5 In April 1836, at the Keeling Islands in the Indian Ocean (lat. 12° S.), the temperature at the bottom, in 363 fathoms, was 45° (very carefully observed). No. 51. TABLE OF REMARKABLE HEIGHTS VISIBLE FROM A SHIP. The heights given in this table were ascertained by angular mca> surement : they are on the coasts of South America, the Falldand Islands, and the Galapagos. Summits. Feet. Abingdon Island .......... 1,950 Acari Mount 1 ,650 Aconcagua 23,200 Ahuja Point, Height near .. 1,000 Albemarle Island, S.W. summit 4,700 Albemarle Island, S.E. ditto 3,720 Albemarle Island, Middle ditto 3,780 Albemarle Island, North ditto 3,500 Albemarle Island, over Cape Berkeley 2,360 Alexander Mount 1,960 Amatape Mountain 3,270 Summits. Feet. Animas Las, Height south of 1,800 Aymond Mount 1,000 Banks Hill, Good Success Bay 1 ,400 Bell Mount (Tierra del Fuego) 2,600 Benson Mount 1,780 Bofjueron Mount 3,000 BufaderoHill 1,620 Burney Mount 5,800 Callao, Height near 3,000 Campana Mount 3,450