^{page 537 note *} Berg, G., “Gesteine von Angola, Saõ Thomé, und St Helena,” Tscher, min. u. petr. Mitth., xxii (1903), pp. 357–362.Google Scholar

^{page 537 note †} Holmes, A., “Contribution to the Petrology of North-western Angola,” Geol. Mag., dec. vi, vol. ii, pp. 228–232; 267–272; 322–328; 366–370, 1915.CrossRefGoogle Scholar

^{page 537 note ‡} Gomes, J. P., “Échantillons de roches recueillis entre Benguella et Catoco,” Comm. Dir. Trab. Géol. Portugal, vol. iii, fasc. 11, pp. 239–243, 1898.Google Scholar

^{page 537 note §} Nasciamento, J. P. de, and Mattos, A. A. de, A colonisaçãao de Angola, Lisbon, 163 pp., 1912.Google Scholar

^{page 538 note *} The numbers refer to the registration numbers of the rocks in Professor Gregory's collection.

^{page 539 note *} Holland, , “The Charnockite Series,” Mem. Geol. Surv. India, vol. xxviii, part ii, p. 124, 1900.Google Scholar

^{page 540 note *} cf. “Charnockite of the Ivory Coast,” Lacroix, , Comptes Bendus, cl (1910), p. 20.Google Scholar

^{page 540 note †} Holland, op. cit., p. 157.

^{page 542 note *} The terms felsic and mafic (Cross, , Iddings, , Pirsson, , and Washington, , Journ. Geol., xx, 1912, p. 560Google Scholar) are used to denote two main groups of rock-forming minerals, one containing quartz, felspars, and felspathoids, and the other pyroxenee, amphiboles, micas, olivine, iron-ores, etc. Variations in the relative proportions of these groups give rise to the important variations in igneous rocks denoted qualitatively by Brögger's terms, leucocratic and melanocratic. A quantitative meaning may be imparted to the terms felaic and mafic by attaching the prefixes do- and per-, with exactly the same connotation in respect to the mode (actual mineralogical composition) as the analogous terms persalic, dosalic, etc., have in respect to the norm (standard mineral composition) of the American Quantitative Classification.

^{page 543 note *} Lacroix, A., “Sur l'existence à la Côte d'Ivorie d'un séries pétrog. comparable à celle de la charnockite,” Comptes Rendus, cl (1910), pp. 18–22.Google Scholar

^{page 546 note *} Eskola, P., “Petrology of the Orijarvi Region in South-western Finland,” Bull. Comm. Geol. de Finlande, No. 40, 1914, pp. 14, 15, 131.Google Scholar

^{page 546 note †} Holland, op. cit., p. 232.

^{page 547 note *} “Geology and Ore Deposits of Butte, Mont.,”; U.S. Geol. Surv., Prof. Paper No. 74,. 1912, p. 36.Google Scholar

^{page 549 note *} See Iddings, , Igneous Rocks, vol. ii, 1913, p. 104.Google Scholar

^{page 549 note †} Igneous Rocks and their Origin, 1914, pp. 19, 25.

^{page 552 note *} Tscherm. min. petr. Mitth., vol. xxii (1903), p. 359.Google Scholar

^{page 552 note †} Geol. Mag., dec. vi, vol. ii (1915), p. 323.Google Scholar

^{page 553 note *} Gesteinlehre, 3rd ed., 1910, p. 199.

^{page 553 note ‡} Weed, and Pirsson, , Bull. Geol. Soc. America, vol. vi, 1895, p. 415.Google Scholar

^{page 553 note §} Pirsson, , “Geol. and Petr. of Highwood Mountains, Mont.,” U.S. Geol. Surv., Bull. 237, 1905, p. 104.Google Scholar

^{page 553 note ∥} Lacroix, Nouv. Arch, du Mus., 1902, p. 179.

^{page 553 note ¶} Lacroix proposes to use the term theralite in this sense. This, however, ignores Rosenbusch'S plain intention of using this term for the plagioclase-nepheline rocks of plutonic habit. It is true that the original “theralite” of the Crazy Mountains, Montana, on which Rosenbusch erected the group, was erroneously described by Wolff as carrying plagioclase, and is in fact a shonkinite in the sense of Rosenbusch and Iddings. Lacroix'S usage of the term theralite, however, merely perpetuates the original mistake in the diagnosis of the Crazy Mountain rocks. When Rosenbusch discovered the mistake, he promptly withdrew these rocks from the theralite group, and placed them under shonkinite. He then created as his type theralite the unquestionable plagioclase-nepheline rock of Duppau in Bohemia, thus preserving his term theralite with its original connotation.

^{page 553 note **} Loc. cit., p. 203.

^{page 553 note †} Igneous Rocks, vol. ii, 1913, p. 230.Google Scholar

^{page 554 note *} Mostly soda-orthoclase.

^{page 554 note †} Magnetite and ilmenite.

^{page 557 note *} Rosenbusch, Gesteinlehre, 1910, p. 304.

^{page 558 note *} Rosenbusch, Gesteinlehre, 1910, p. 304.