^{page 530 note 1} “The Microscope in Geology,” by David Forbes, F.R.S., Popular Science Review, 1867, vol. vi. p. 355.

^{page 532 note 1} D. Forbes, “On Meteorites,” Geol. Mag. 1872, Vol. IX. pp. 230–1.

^{page 532 note 2} Of these, 183 are “Aerolites” or stone meteorites; 12 are “Siderolites” or stony irons; and 102 are “Aerosiderites” or iron meteorites.

^{page 534 note 1} S. Allport, “Igneous Rocks of Arran,” Geol. Mag. 1872, Vol. IX. p. 544. See also op. cit. 1873, Vol. X. p 196.

^{page 534 note 2} Prof. Hull, Geol. Mag. 1873, Vol. X. pp. 153 and 193.

^{page 535 note 1} Reclus’ “The Earth,” English Edition, section i. chap. xix.

^{page 535 note 2} Ansted's Physical Geography, p. 74.

^{page 535 note 3} See “Observations on the Internal Fluidity of the Earth,” by G. Poulett-Scrope, F.R.S., Geol. Mag. 1868, Vol. V. p. 537, and Vol. VI. p. 145. “Cause of Volcanic Action,” Geol. Mag. 1869, Vol. VI. p. 196. Prefatory Remarks to the Reissue of Mr. Poulett-Scrope's great work on Volcanos, 1872, London, 8vo., Longmans, pp. 490, illustrated by plate and map and about seventy woodcuts, with a Second Appendix of Earthquakes and Volcanic Eruptions from 1860–72.

^{page 535 note 4} See Prof. Dana's papers in Dana's and Silliman's American Journal of Science, 1873, vol. v. no. 29, p. 347, no. 30, p. 423; vol. vi. no. 31. p. 6, no. 32, p. 104, no. 33, p. 161. Prof. Dana's views were originally published in 1847.

^{page 536 note 1} “The Eruption of Vesuvius in 1872,” by Prof. Palmieri, with Notes and Introductory Sketch of Terrestrial Vulcanicity, by Robert Mallet, F.R.S. London, Asher & Co., 1873.

^{page 536 note 2} Hall's Palæontology of New York. See abstract of Prof. Hall's views by Prof. Dana, Silliman's Journal of Science, 1873, vol. v. no. 29, p. 347.

^{page 536 note 3} Prof. T. Sterry Hunt, on “The Origin of Continents,” Geol. Mag. 1867, Vol. IV. p. 223. “Chemistry of the Primeval Earth,” ibid. 1867, Vol. IV. pp. 357 and 477. “On the Probable Seat of Volcanic Action,” Geol. Mag. 1869, Vol. VI. p. 245; ibid. 1870, Vol. VII. p. 60.

^{page 536 note 4} Prof. Shaler, “Formation of Mountain Chains,” Geol. Mag. 1868, Vol. V. p. 511.

^{page 536 note 5} Rev. O. Fisher, “On the Elevation of Mountain Chains,” Geol. Mag. 1868, Vol. V. p. 493, and 1873, Vol. X. p. 248.

^{page 536 note 6} Prof. J. D. Whitney, “On Mountain Building,” p. 101.

^{page 536 note 7} Prof. Le Conte in Silliman's American Journal of Science, 1872, vol. iv. no. 23, p. 345, and no. 24, p. 460.

^{page 536 note 8} H. B. Medlicott, “On the Alps and Himalayas,” Quart. Journ. Geol. Soc. 1868, vol. xxiv. p. 34.

^{page 536 note 9} Captain F. W. Hutton, “On the Formation of Mountains,” Geol. Mag. 1873, Vol. X. p. 166.

^{page 536 note 10} Prof. Shaler, Geol. Mag. 1868, Vol. V. p. 514.

^{page 539 note 1} See Dana's and Silliman's American Journal of Science, 1872, vol. iv. no. 23, p. 345, no. 24, p. 460; 1873, vol. v. no. 30. p. 448.

^{page 539 note 2} “On Subsidence the Effect of Accumulation,” by Dr. Charles Ricketts, F.G.S. Geol. Mag. 1872, Vol. IX. p. 119.

^{page 539 note 3} Prof. James Hall, Palæontology of New York.

^{page 539 note 4} “On Volcanos,” by H. Woodward, Proc. Geol. Assoc. 1871, vol. ii. p. 6, fig. 1; and Geol. Mag. 1871, Vol. VIII. p. 338.

^{page 540 note 1} See the Duke of Argyll’s Address as President of the Geol. Soc., Lond., Quart. Journ. Geol. Soc. 1873, vol. xxix. p. xxx. and p. 508.

^{page 540 note 2} See Silliman's American Journal, No. 19, for July, 1872, article by Ch. F. Hartt, p. 53.

^{page 540 note 3} See Geol. Mag. 1872, Vol. IX. pp. 289, 355, 409, 449, 516.

^{page 541 note 1} See Dana and Silliman's American Journal of Science, 1872, third series, vol. iii. p. 161, and p. 295.

^{page 541 note 2} See Dana and Silliman's American Journal of Science, 1873, vol. v. p. 69, and p. 325.

^{page 541 note 3} Researches in the Lingula Flags of South Wales (Joint Report to British Association, Birmingham, 1865), Geol. Mag. 1866, Vol. III. p. 27. On Lingulella from, the Lower Cambrian, Quart. Journ. Geol. Soc. 1867, vol. xxiii. p. 339. On some Fossils from the Menevian Group, ibid. vol. xxiv. p. 510; ibid. vol. XXV. p. 51. “On the Ancient Rocks of St. Davids Promontory,” by H. Hicks and Prof. Harkness, and “Descriptions of New Species, ” by H. Hicks, ibid. 1871, vol. xxvii. p. 384. “On some Undescribed Menevian Fossils”, by H. Hicks, ibid. vol. xxviii. p. 173. “The Tremadoc Rocks of St. Davids, ” by H. Hicks, ibid. 1873, vol. xxix. p. 39. “On the Classification of the Cambrian and Silurian Rocks, ” by Henry Hicks, Proc. Geol. Association, 1873, vol. iii. p. 99.

^{page 542 note 1} “History of the Names Cambrian and Silurian,” Geol. Mag. 1873, Vol. X. pp. 385, 453, 504, etc.; see also the “Canadian Naturalist,” new series, vol. iv. p. 281, etc.

^{page 543 note 1} Prof. Huxley's generalization as to all bituminous coals being largely made up of these bodies has never been accepted by geologists, and is certainly opposed to many well-known and recognized facts regarding the formation of coal.

^{page 544 note 1} See “Relics of the Carboniferous and other Old Land-surfaces” by H. Woodward, Proc. Geol. Association, 1872, vol. ii. p. 231.

^{page 544 note 2} Silliman's American Journal, October, 1872, p. 282.

^{page 546 note 1} Trans. Lin. Soc. 1873, vol. xxviii. pt. iii. p. 459, plates xxxvi. to xxxix.

^{page 546 note 2} Ann. des Sc. Nat. Zoologie et Paleontologie, 1872–3, 5th series, tome xvii. p. 25, plates v. to xvi.

^{page 546 note 3} “The Development of Limulus polyphemus,” by A. S. Packard, jun., M.D., Mem. Boston Soc. Nat. Hist., 1872, vol. xi. pp. 155–202, pl. iii.–v.

^{page 546 note 4} “Zur Embryologie und Morphologie des Limulus polyphemus,” von Dr. Anton Dohrn, Jenaische Zeitschrift, 1871, Bd. vi. Heft 4, p. 580, Taf. xiv. and xv.

^{page 548 note 1} The range of the African Ostrich was formerly much greater. It extended into Arabia, Persia, and part of India, within the human period, but has been killed off by man.

^{page 548 note 2} Phil. Trans. 1863, p. 33. See also article by H. Woodward in Intellectual Observer, Dec. 1862, vol. ii. p. 313, and plate; and by S. J. Mackie, Geologist, 1863, vol. vi. p. 1.

^{page 549 note 1} See the Quart. Journ. Geol. Soc. 1873, vol. xxix. p. 511, pl. xvi. and xvii., and abstract in Geol. Mag. for August last, p. 376.

^{page 549 note 2} “Geology of Oxford and the Valley of the Thames,” by John Phillips, M.A., F.R.S., F.G.S., etc., 1871, p. 196.

^{page 550 note 1} See King's Survey of Australia, 8vo., 1827, vol. ii., Appendix, p. 424.