s great authority when made by such scientists
as Driesch or Reinke, for example; and, on the other hand, the
hypotheses which this vitalism superposes on mechanism (the
"entelechies" of Driesch, and the "dominants" of Reinke, etc.). Of these
two parts, the former is perhaps the more interesting. See the admirable
studies of Driesch--_Die Lokalisation morphogenetischer Vorgange_,
Leipzig, 1899; _Die organischen Regulationen_, Leipzig, 1901;
_Naturbegriffe und Natururteile_, Leipzig, 1904; _Der Vitalismus als
Geschichte und als Lehre_, Leipzig, 1905; and of Reinke--_Die Welt als
Tat_, Berlin, 1899; _Einleitung in die theoretische Biologie_, Berlin,
1901; _Philosophie der Botanik_, Leipzig, 1905.]

[Footnote 22: P. Guerin, _Les Connaissances actuelles sur la fecondation
chez les phanerogames_, Paris, 1904, pp. 144-148. Cf. Delage,
_L'Heredite_, 2nd edition, 1903, pp. 140 ff.]

[Footnote 23: Mobius, _Beitrage zur Lehre von der Fortpflanzung der
Gewachse_, Jena, 1897, pp. 203-206 in particular. Cf. Hartog, "Sur les
phenomenes de reproduction" (_Annee biologique_, 1895, pp. 707-709).]

[Footnote 24: Paul Janet, _Les Causes finales_, Paris, 1876, p. 83.]

[Footnote 25: _Ibid._ p. 80.]

[Footnote 26: Darwin, _Origin of Species_, chap. ii.]

[Footnote 27: Bateson, _Materials for the Study of Variation_, London,
1894, especially pp. 567 ff. Cf. Scott, "Variations and Mutations"
(_American Journal of Science_, Nov. 1894).]

[Footnote 28: De Vries, _Die Mutationstheorie_, Leipzig, 1901-1903. Cf.,
by the same author, _Species and Varieties_, Chicago, 1905.]

[Footnote 29: Darwin, _Origin of Species_, chap. vi.]

[Footnote 30: Darwin, _Origin of Species_, chap. i.]

[Footnote 31: On this homology of hair and teeth, see Brandt, "Uber ...
eine mutmassliche Homologie der Haare und Zahne" (_Biol. Centralblatt_,
vol. xviii., 1898, especially pp. 262 ff.).]

[Footnote 32: It seems, from later observations, that the transformation
of Artemia is a more complex phenomenon than was first supposed. See on
this subject Samter and Heymons, "Die Variation bei Artemia Salina"
(_Anhang zu den Abhandlungen der k. preussischen Akad. der
Wissenschaften_, 1902).]

[Footnote 33: Eimer, _Orthogenesis der Schmetterlinge_, Leipzig, 1897,
p. 24. Cf. _Die Entstehung der Arten_, p. 53.]

[Footnote 34: Eimer, _Die Entstehung der Arten_, Jena, 1888, p. 25.]

[Footnote 35: _Ibid._ pp. 165 ff.]

[Footnote 36: Salensky, "Heteroblastie" (_Proc. of