[118]. The term “felsitic andesite” is suitable for this microfelsitic type.

[119]. I have borrowed this term from Rosenbusch’s Microscopical Physiography of the Rock-making Minerals, translated by Iddings.

[120]. Challenger Reports, Physics and Chemistry II.

[121]. Neues Jahrb. fur Mineralogie, 1884.

[122]. For their mode of occurrence, see pp. [215], [220], [230-233].

[123]. Highly altered rocks of this class are exposed at the base of Mount Nailotha as described on p. [215].

[124]. See work quoted on p. 218.

[125]. See p. [230].

[126]. Quart. Journ. Geolog. Soc. xliv. 1888.

[127]. Zirkel’s Petrographie, iii., 694.