[943] Chamisso states that the water which they brought up was cooler, and in their opinion, less salt. It is difficult to conceive its being fresher near the bottom, except where submarine springs may happen to rise.
[944] Kotzebue's Voyage, 1815-1818. Quarterly Review, vol. xxvi. p. 361.
[945] Narrative of a Voyage to the Pacific, &c., in the years 1825, 1826, 1827, 1828, p. 170.
[946] Gloger, Abänd. der Vögel, p. 103.; Pallas, Zoog. Rosso-Asiat., tom. ii. p. 197.
[947] Syst. of Geog., vol. viii. p. 169.
[948] De terrâ habitabili incremento; also Prichard, Phys. Hist, of Mankind, vol. i. p. 17., where the hypotheses of different naturalists are enumerated.
[949] Necker, Phytozool. Philosoph. p. 21.; Brocchi, Conch. Foss. Subap., tome i. p. 229.
[950] Amœn. Acad. vol. vi. p. 17. § 12.
[951] Ibid. vol. vii. p. 409.
[952] Amœn. Acad., vol. vi. p. 17. § 11, 12.