The Prolongation of Life: Optimistic Studies

by Elie Metchnikoff

[56] Ficker, in the Archiv. für Hygiene, vol. lii, p. 179, has recently published the results of an investigation into this.

[57] Quoted by Frédericq et Nuel, Eléments de physiologie humaine, 4th edition, 1899, p. 256.

[58] Quoted by Frédericq et Nuel, op. cit.

[59] L’aviculture (a fortnightly Russian journal), Oct. 1st, 1904, No. 19, p. 3.

[60] Country Life, 1905.

[61] Quoted by Ebstein, Die Kunst d. mensch. Leben zu verlängern, 1891.

[62] Op. cit., p. 12.

[63] Annuaire statistique de la ville de Paris, 23rd year, 1904, p. 164-171.

[64] Ornstein, Virchow’s Archiv., 1891, vol. cxxv, p. 408.

[65] Ebstein, op. cit., p. 70.