the Fourth
International Congress of Zoology_, London, 1899, pp. 111-118). Salensky
has coined this word to designate the cases in which organs that are
equivalent, but of different embryological origin, are formed at the
same points in animals related to each other.]

[Footnote 37: Wolff, "Die Regeneration der Urodelenlinse" (_Arch. f.
Entwicklungsmechanik_, i., 1895, pp. 380 ff.).]

[Footnote 38: Fischel, "Uber die Regeneration der Linse" (_Anat.
Anzeiger_, xiv., 1898, pp. 373-380).]

[Footnote 39: Cope, _The Origin of the Fittest_, 1887; _The Primary
Factors of Organic Evolution_, 1896.]

[Footnote 40: Cuenot, "La Nouvelle Theorie transformiste" (_Revue
generale des sciences_, 1894). Cf. Morgan, _Evolution and Adaptation_,
London, 1903, p. 357.]

[Footnote 41: Brown-Sequard, "Nouvelles recherches sur l'epilepsie due a
certaines lesions de la moelle epinieere et des nerfs rachidiens"
(_Arch. de physiologie_, vol. ii., 1866, pp. 211, 422, and 497).]

[Footnote 42: Weismann, _Aufsatze uber Vererbung_, Jena, 1892, pp.
376-378, and also _Vortrage uber Descendenztheorie_, Jena, 1902, vol.
ii., p. 76.]

[Footnote 43: Brown-Sequard, "Heredite d'une affection due a une cause
accidentelle" (_Arch. de physiologie_, 1892, pp. 686 ff.).]

[Footnote 44: Voisin and Peron, "Recherches sur la toxicite urinaire
chez les epileptiques" (_Arch. de neurologie_, vol. xxiv., 1892, and
xxv., 1893. Cf. the work of Voisin, _L'Epilepsie_, Paris, 1897, pp.
125-133).]

[Footnote 45: Charrin, Delamare and Moussu, "Transmission experimentale
aux descendants de lesions developpees chez les ascendants" (_C.R. de
l'Acad. des sciences_, vol. cxxxv., 1902, p. 191). Cf. Morgan,
_Evolution and Adaptation_, p. 257, and Delage, _L'Heredite_, 2nd
edition, p. 388.]

[Footnote 46: Charrin and Delamare, "Heredite cellulaire" (_C.R. de
l'Acad. des sciences_, vol. cxxxiii., 1901, pp. 69-71).]

[Footnote 47: Charrin, "L'Heredite pathologique" (_Revue generale des
sciences_, 15 janvier 1896).]

[Footnote 48: Giard, _Controverses transformistes_, Paris, 1904, p.
147.]

[Footnote 49: Some analogous facts, however, have been noted, all in the
vegetable world. See Blaringhem, "La Notion d'espece et la theorie de la
mutation" (_Annee psychologique_, vol. xii., 1906, pp. 95 ff.), and De
Vries, _Species and Varieties_, p. 655.]

[Footnote 50: See, on this subject, _Matiere et memoire_, chap. i.]

CHAPTER II

THE DIVERGENT DIRECTIONS OF THE EVOL