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Published online by Cambridge University Press: 01 May 2009
The differences in chemical composition between spherulites and the matrices which contain them have been determined by many analysts. Michel Lévy, in a long and comprehensive paper, quotes some former analyses by Delesse, comparing them with his own, which they closely resembled. Lagario gives many analyses which are especially valuable, as he compares results from acid with those from intermediate and basic rocks, and finds a distinct difference between them. The relations of these results will be briefly considered at the end of the present paper.
page 365 note 1 Bull. Soc. Geol. France, v, 3rd series, p. 232 (1877).Google Scholar
page 365 note 2 Ann. des Mines, xvii, 4th series, p. 116 (1850).Google Scholar
page 365 note 3 See Teall's, “British Petrography,” p. 397.Google Scholar
page 367 note 1 Mean of two.
page 367 note 2 All the iron is calculated as FeO.
page 367 note 3 Another calculated as Na2O=7.48.
page 367 note 4 The oxygen ratio is equal to % oxide in rock x % oxygen in oxide/100
page 369 note 1 In making this glass the principal material employed is a granite or granulite. See President's Address, Quart. Journ. Geol. Soc. 1885, Proc., pp. 88, 90.Google Scholar
page 369 note 2 The description is written from a new slice, which is thinner than the one used in 1885.
page 369 note 3 Ut suprà.—Of two analyses given of the original granite, the most likely one of the two is chosen.
page 369 note 4 The iron here is probably too high.
page 369 note 5 Probably contains some lime.
page 370 note 1 Loc. cit.
page 370 note 2 Loc. cit.