[2]. History of America Before Columbus, P. De Roo, vol I, pp. 173, 176, 177, 178.

[3]. Pre-Historic America, pp. 10, 11.

[4]. Pre-Historic America, pp. 13, 14

[5]. The Pre-Historic World, or Vanished Races, E. A. Allen, introduction, pp. 23, 24.

[6]. Native Races, vol. II, pp. 116, 117, Bancroft.

[7]. Atlantis, (Donnely) p. 349.

[8]. American Antiquities, Priest, p. 186.

[9]. Ancient America, (Baldwin) pp. 92, 93.

[10]. History of the United States, Book I, American Antiquities, pp. 93, 94.

[11]. The Pre-Historic World, or Vanished Races, by E. A. Allen (1885), pp. 564, 566. I quote this passage upon the location, extent and grandeur of the ancient ruins of Central America with the greater pleasure because Mr. Allen is one of the authors who, as far as possible, discount the extent, greatness and very remote antiquity of the civilization represented by American ruins; though for all this his work is one of the most conscientious and valuable upon the subject.