[55] Kolle u. Wassermann, _Handb. d. pathogenen Mikro-organismen_, vol. ii, 1903, p. 678. [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. [66] Lejoncourt, _Galerie des centenaires_, Paris, 1842, p. 96-98. [67] Lejoncourt, _op. cit._, p. 101. [68] _Researches into the Physical History of Mankind_, 1836, vol. i, p. 1157. [69] I owe to the kindness of M. Chemin a memoir in which he has brought together the ancient and new records on the centenarians of all countries up to the end of the nineteenth century. M. Chemin was unable to find a publisher, but has given me his manuscript, extending to 182 pages. [70] _Ueber die Kunst d. Verlängerung d. mensch. Lebens_, Bonn, 1890, p. 23. [71] _Physiologie générale_, 1900, p. 381. [72] _Tableaux de la nature_ (French translation), 1808, vol. ii, p. 109. [73] Webb and Berthelot, _Histoire naturelle des îles Canaries_, 1839, vol. i, part 2, pp. 97-98. [74] _Bibliothèque universelle de Genève_, 1839, vol. xlvi, p. 387. [75] _Ibid._, p. 392. [76] _Bibliothèque universelle de Genève_, vol. xlvii, p. 49. [77] _Entstehung u. Begriff d. naturhistorischen Art_, 2nd edit., Munich, 1865, p. 37. [78] Griesebach, _Die Vegetation der Erde_. [79] Batalin, _Acta Horti Petropolitani_, vol. xi, no. 6, 1890, p. 289. [80] I am indebted to Prof. Hugo de Vries for this and other instances of the prolongation of life in plants. [81] Engler’s _Botanische Jahrbücher_, Leipzig, 1882, vol. ii, p. 51. [82] _Organographie der Pflanzen_, Iéna, 1898-1901. [83] _Bulletin du jardin botanique de Bruxelles_, vol. i, no. 6, 1905. [84] Hugo de Vries, _Jahrbücher für wissensch. Botanik_, 1890, vol. xxii, p. 52. [85] _Annales de l’Institut Pasteur_, 1902, p. 71. [86] Duclaux, _Microbiologie_, vol. iii, 1900, p. 460. [87] _Archiv. für Anatomie und Physiologie_, 1864. [88] _Archives de Zoologie expérimentale_, 1901, vol. ix, p. 81. [89] Observations of Dr. Speyer, quoted by Weismann. [90] See _The Nature of Man_. [91] _Étude clinique sur la vieillesse_, Paris, 1886, p. 145. [92] _Revue scientifique_, 1877, p. 1173. [93] _Revue scientifique_, 1887, 2nd part, p. 105. [94] Gabriel Bertrand, _Annales de l’Institut Pasteur_, 1904, p. 672. [95] _Therapeutische Monatshefte_, 1904, p. 193. [96] _Münchener medicinische Wochenschrift_, 1904, No. 1; _Verhandlungen der physiologischen Gesellschaft zu Berlin_, Dec. 5th, 1904.