^{page 183 note *} Thomson, Wyville, Proc. Roy. Soc. Edin., xxiii, p. 47, 1874.Google Scholar

^{page 183 note †} Proc. Roy. Soc. Edin, ix. p. 247, 1877.

^{page 183 note ‡} In which the contemporary or shortly subsequent soundings of several other vessels are also made use of.

^{page 183 note §} Murray, and Philippi, , Wiss. Erg. Deutsch. Tiefsee–Exp., x. p. 4, Jena, 1908.Google Scholar

^{page 183 note ║} Philippi, , Verh. XV Deutsch. Geographentages, Danzig, 1905, pp. 28–33 Google Scholar.

^{page 183 note ¶} Murray, and Lee, , Mem. Mus. comp. Zoöl., xxxviii., 1909.Google Scholar

^{page 184 note *} Challenger Reports, “Deep-Sea Deposits,” 1891, pp. 190, 340.

^{page 184 note †} For an account of the colloidal characteristics of clay see Rohland, , Abegg's Handb. d. anorg. Chem., iii. 1, pp. 90–102, 1906.Google Scholar

^{page 185 note *} Challenger Reports, “Deep-Sea Deposits,” pp. 425–433.

^{page 185 note †} Quart. Jour. Geol. Soc., li. p. 315, 1895.

^{page 185 note ‡} Challenger Reports, “Deep-Sea Deposits,” pp. 434, 435.

^{page 185 note §} Proc. Roy. Soc. Edin., xxvii, p. 170, 1907.

^{page 185 note ‖} Challenger Reports, “Deep-Sea Deposits,” p. 424.

^{page 187 note *} Pogg. Ann., xxxv. p. 331, 1835.

^{page 187 note †} For a full account see Berdel, Sprechsaal, 1902, pp. 881, 919, 959.

^{page 192 note *} The volcanic glass from Challenger Station 302 (analysis, Challenger Reports, “Deep-Sea Deposits,” p. 307) was tested and found to contain not a trace of barium.

^{page 192 note †} Radioactivity and Geology, London, 1909, p. 50.

^{page 195 note *} Zeitschr. Anorg. Chem., xlii. 265–324, 1904.

^{page 195 note †} Caspari, , Mem. Mus. comp. Zoöl., xxxviii, p. 169, 1909 Google Scholar.

^{page 195 note ‡} Wittstein, Vierteljahrsschr. f. pharm., i. p. 275; Spring, Neues Jahrb., 1899, p. 47.

^{page 195 note §} Loc. cit.

^{page 196 note *} Zeitschr. deutsch. geol. Ges., xxviii, p. 519, 1896.

^{page 196 note †} Centralbl. f. Min., 1908, pp. 622, 661.

^{page 196 note ‡} Loc. cit.

^{page 197 note *} Bütschli, , Untersuchungen über Strukturen, Leipzig, 1898 Google Scholar; Hardy, , Journ. of Physiol., xxiv. p. 158, 1899.CrossRefGoogle Scholar

^{page 197 note †} Zeitschr. deutsch. geol. Ges., xxxix, p. 594, 1887; xl. p. 637, 1888.

^{page 197 note ‡} Amer. Journ. Sci., vi. p. 270, 1898; Phil. Mag., xlvii, p. 461, 1899.

^{page 198 note *} Silica cannot, however, accumulate in solution, but is returned to the bottom by biological agencies as diatom or radiolarian ooze.

^{page 200 note *} Challenger Reports, “Deep-Sea Deposits,” p. 307.

^{page 200 note †} Cf. Vesterberg, and Mauzelius, , Bull. Geol. Inst. Upsala, v., No. 9, p. 125, 1900.Google Scholar

^{page 200 note ‡} Challenger Reports, “Deep-Sea Deposits,” passim.