[62] “The Depths of the Sea,” pp. 376 and 377.
[63] “The Threshold of the Unknown Region,” p. 95.
[64] See “Physical Geography of the Sea,” chap. ix., new edition, and Dr. A. Mühry “On Ocean-currents in the Circumpolar Basin of the North Hemisphere.”
[65] “Depths of the Sea,” Nature for July 28, 1870.
[66] “Memoir on the Gulf-stream,” Geographische Mittheilungen, vol. xvi. (1870).
[67] Dr. Carpenter “On the Gulf-stream,” Proceedings of Royal Geographical Society for January 9, 1871, § 29.
[68] Dr. Petermann’s Mittheilungen for 1872, p. 315.
[69] Proceedings of the Royal Society, vol. xvii., p. 187, xviii., p. 463.
[70] The average depth of the Pacific Ocean, as found by the soundings of Captain Belknap, of the U.S. steamer Tuscarora, made during January and February, 1874, is about 2,400 fathoms. The depth of the Atlantic is somewhat less.
[71] Proceedings of Royal Geographical Society, vol. xv., § 22.