Report on the scientific results of the voyage of during the years 1873-76 : under the command of Captain George SNares, , Captain Frank Turle Thomson, . e-quarters of a mile A channel ten miles wide, and over 465 fathoms deep, 1 For the natural history of tliia little group, see Thomson, The Atlantic, vol. i. p. 185 (with a map); Moseley,Notes of a Naturalist on the Challenger, p. 126 ; Karr. Chall. Exp., vol. i., pp. 262 et seq. For its geology, seeBuchanan, Proc. Roy. Soc, vol. xxiv. pp. 614, 615. (PHYS. CHEM. CHALL. EXP.—PART VII.—1889.) 12 90 THE
Report on the scientific results of the voyage of during the years 1873-76 : under the command of Captain George SNares, , Captain Frank Turle Thomson, . e-quarters of a mile A channel ten miles wide, and over 465 fathoms deep, 1 For the natural history of tliia little group, see Thomson, The Atlantic, vol. i. p. 185 (with a map); Moseley,Notes of a Naturalist on the Challenger, p. 126 ; Karr. Chall. Exp., vol. i., pp. 262 et seq. For its geology, seeBuchanan, Proc. Roy. Soc, vol. xxiv. pp. 614, 615. (PHYS. CHEM. CHALL. EXP.—PART VII.—1889.) 12 90 THE VOYAGE OF CHALLENGER. separates Nightingale from Inaccessible, while depths beyond 1000 fathoms occur insome places between Nightingale and Tristan. On account of the weather and the difficulty of gaining access to the interior ofNightingale, the Challenger naturalists had to limit their geological collections to therocks which cropped out near the shore. Nightingale differs greatly in appearance fromthe other islands of the group, being more varied in outline and surrounded by cliffsonly thirty or forty feet high, and often less. The southern part of the island is more. Nightingale Island, from the North. picturesque, the ground rising by successive crests to a peak 1105 feet high, one side ofwhich is almost vertical for half its height. Mr. Buchanan was unable to ascend thishill, but he describes the rock as being greyish in colour, and of a sub-columnarstructure. The rest of Nightingale is undulating, and the rocks, except at a few isolatedpoints, are covered with verdure. No traces of recent volcanic activity are to be rocks of the coast are chiefly a conglomerate or breccia of doleritic fragmentsembedded in a whitish felspathic mass. Here and there the conglomerate is surroundedby beds of volcanic rock probably of more ancient origin. Marine erosion has hollowedthe cliffs girdling the island into innumerable caves, formerly the refuge of seals, which RE
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