It is obvious that, notwithstanding the necessity for fitting man's line of descent into the genealogical tree of the Primates, especially the apes, opinions in regard to it differ greatly in detail. This could not be otherwise, since the different Primate forms, especially the fossile forms, are still far from being exhaustively known. But one thing remains certain,--the idea of the close relationship between man and monkeys set forth in Darwin's _Descent of Man_. Only those who deny the many points of agreement, the sole basis of classification, and thus of a natural genealogical tree, can look upon the position of Darwin and Haeckel as antiquated, or as standing on an insufficient foundation. For such a genealogical tree is nothing more than a summarised representation of what is known in regard to the degree of resemblance between the different forms. Darwin's work in regard to the descent of man has not been surpassed; the more we immerse ourselves in the study of the structural relationships between apes and man, the more is our path illumined by the clear light radiating from him, and through his calm and deliberate investigation, based on a mass of material in the accumulation of which he has never had an equal. Darwin's fame will be bound up for all time with the unprejudiced investigation of the question of all questions, the descent of the human race. FOOTNOTES: [Footnote 75: _Life and Letters of Thomas Henry Huxley_, Vol. I. p. 171, London, 1900.] [Footnote 76: _Ibid._, p. 363.] [Footnote 77: No italics in original.] [Footnote 78: _Life and Letters of Charles Darwin_, Vol. I. p. 93.] [Footnote 79: _Ibid._ Vol. II. p. 263.] [Footnote 80: _Ibid._ Vol. I. p. 94.] [Footnote 81: _Life and Letters_, Vol. III. p. 175.] [Footnote 82: _Ibid._ Vol. II. p. 109.] [Footnote 83: _Ibid._ Vol. III. p. 112.] [Footnote 84: _Ibid._ Vol. I. pp. 304-317.] [Footnote 85: _Life and Letters_, Vol. I. p. 309.] [Footnote 86: _Loc. cit._ p. 313.] [Footnote 87: _Ibid._ Vol. II. p. 310.] [Footnote 88: _Ibid._ Vol. III. p. 236. ["C. Ridley," Mr. Francis Darwin points out to me, should be H. N. Ridley. A.C.S.]] [Footnote 89: _Descent of Man_ (Popular Edit., 1901), fig. 1, p. 14.] [Footnote 90: G. Schwalbe, "Das Darwin'sche Spitzohr beim menschlichen Embryo," _Anatom. Anzeiger_, 1889, pp. 176-189, and other papers.] [Footnote 91: _Descent of Man_, fig. 3, p. 24.] [Footnote 92: _Descent of man_, p. 6.] [Footnote 93: _Ibid._ p. 54.] [Footnote 94: _Descent of Man_, p. 92.] [Footnote 95: _Ibid._ p. 100.] [Footnote 96: _Life and letters_, Vol. II. p. 161, June 22, 1859.] [Footnote 97: _Ibid._ Vol. III. p. 15, March 17, 1863.] [Footnote 98: _Descent of Man_, p. 132.] [Footnote 99: _Ibid._ pp. 136, 137.] [Footnote 100: _Ibid._ p. 143.] [Footnote 101: _Ibid._ p. 193.] [Footnote 102: _Descent of Man_, p. 231.] [Footnote 103: _Descent of Man_, p. 308.] [Footnote 104: _Life and Letters_, Vol. II. p. 23.] [Footnote 105: _Loc. cit._ p. 39.]