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On the previous occasions upon which I have had the honour of lecturing in this hall, my observations were confined to the consideration of the structure of the earth beneath our feet. Now, however, I would crave your indulgence still further, when I attempt to carry your thoughts with me to infinitely higher regions by directing your attention to the study of what may be termed the mineralogy of the heavens above us.
Being a lecture delivered at St. George's Hall, Langham Place, London, 7th April, 1872.
3 See Geol. Mag., 1870, Vol. VII., p. 314. Lecture on Volcanos, delivered June 19th, 1870.