Wright’s “Studies in Science and Religion,” p. 308. “Men of the Drift,” p. 71. Geikie’s “Great Ice Age,” p. 93. “Men of the River Drift.” Abbott’s “Primitive Industry,” p. 545; Quoted from “Geology of Minnesota.” Report, 1877, p. 37. Geikie’s “Great Ice Age,” p. 97. The astronomical theory, which we will first examine, was first enunciated by Mr. Croll, following a suggestion of the astronomer Adhemer. Mr. Croll’s views were set forth in many able papers, and finally gathered into a volume entitled “Climate and Time in their Geological Relation.” The ablest defense of these views is that by Mr. James Geikie, in his works “The Great Ice Age,” and “Prehistoric Europe.” Geikie’s “Great Ice Age,” p. 114. Lubbock’s “Prehistoric Times,” p. 420, Table 4. Ibid., Table 5. Geikie’s “Great Ice Age,” p. 123. Wallace’s “Island Life,” p. 143. Ibid., p. 124. “Geology of New Hampshire,” Vol. II, p. 5. Wallace’s “Island Life,” p. 99. Geikie’s “Great Ice Age,” p. 103. Wallace’s “Island Life,” p. 149. Hitchcock’s “Geology of New Hampshire,” Vol. II, p. 7, gives a map showing what immense areas in that section would be raised to the surface by a raise of three hundred feet. _American Journal of Science,_ 1871, p. 329. Wallace’s “Island Life,” p. 184. Wallace’s “Island Life,” p. 182. Ibid., p. 157 and note. Prof. Wright thinks this statement doubtful. He refers to the date of the Glacial Age in the Southern Hemisphere. Wallace’s “Island Life,” p. 200; Dawkins’s “Early Man in Britain,” p. 119; Geikie’s “Great Ice Age,” p. 256; Quatrefages’s “Human Species,” p. 288. For these results, see McFarland’s Calculations in “American Journal of Science,” 1880, p. 105. “Island Life,” p. 153. See chart, p. 124, Wallace’s “Island Life.” “Ancient Society,” p. 39. “Island Life,” p. 201. “Prehistoric Europe,” p. 312. On this point consult Wright’s “Studies in Science and Religion,” pp. 232-347; also Prof. Lewis in “Primitive Industry,” pp. 547-551. “Prehistoric Europe,” p. 560. See any isothermal map. Wallace’s “Island Life,” p. 154, note. “Geology of New Hampshire,” Vol. III, p. 327, referred to in Wright’s “Studies in Science and Religion,” p. 327. Chapter VI THE NEOLITHIC AGE IN EUROPE.1