[9]. Dr. Black’s analysis of the Geyser water is—
| Soda, | 0.95 |
| Dry Sulphate of Soda, | 1.46 |
| Muriate of Soda, | 2.46 |
| Silica, | 5.40 |
| Alumina, | 0.48 |
| 10.75 |
[10]. From the specific gravity of the globe, taken in connection with the increasing ratio of heat as we descend from the surface, it is calculated that all metals and rocks are melted at a depth of thirty miles below the sea level, and that the fluid mass is chiefly melted iron; while the temperature would indicate somewhere about 4000° Fahrenheit.
[11]. The specimens nearly all became red before they got home, and Dr. R. Angus Smith, F.R.S. &c., has since fully confirmed my surmise as to the origin of the colours.
[12]. See Olafsen’s Reise, th. ii. p. 138-140. Finnsen’s Efterretning om Tildragelserne ved Bierget Hekla. (Copenhagen 1767). Barry’s Orkney Islands, p. 13; quoted by the author of Iceland, Greenland, and the Faröe Islands, pp. 30-1.
[13]. See illustration at p. [84].
[14]. See note at foot of page [65].
[15]. Alluding to the old Icelandic female head-dress which is now again being introduced—See [illustration] p. 68.
[16]. See [illustration] at p. 53.
[17]. Hassel, vol. 10. p. 231-233. Mackenzie, p. 312-323. Henderson, vol. 1. p. xxvi. Barrow, pp. 293-305. Iceland, Greenland, and the Faröe Islands, pp. 209-10.