ment. It is
certainly not the sorry explanation in terms of "Variation and
Selection," but that of a spontaneous imitation of the surroundings,
that forces itself irresistibly upon us in this connection.

48 Jena, 1892 and 1895.

49 See Reinke, "Einleitung in die theoretische Biologie," 1901,
especially pp. 463 onwards on "Phylogenetisches Bildungspotential."
von Wettstein (On direct adaptation), "Neolamarkismus," Jena, 1902.
_Cf._ "Wissensch-Beitraege zum 15 Jahresberichte (1902) der Philos.
Gesellschaft an der Universitaet zu Wien: Vortraege und Besprechungen
ueber die Krisis der Darwinismus." M. Kassowitz, "Allgemeine
Biologie," I. and II., 1899. O. Hertwig, "Entwicklung der Biologie
im 19. Jahrhundert." Wiesner, "Elemente der wissenschaftlichen
Botanik." (_cf._ especially III. "Biologie der Pflanzen"), and on p.
288 the summary of propositions which are very similar to those
formulated later by Korschinsky. ("Auf Grund des den Organismen
innewohnenden Vervollkommnungstriebes.")

50 See the particularly beautiful and suggestive experiments of
Haberlandt: "Experimentelle Hervorrufung eines neuen Organs." In
"Festschrift fuer Schwendener," Berlin Borntraeger, 1899.

51 See "Nature," 1891, p. 441

52 See "Nature," 1891, p. 441.

53 The variation-increment of the selection theory ought to be a
differential. But in many cases it is not so. As for instance in
symmetrical correlated variation, &c. In the struggle for existence
it is usually not advantages of organisation which are decisive, but
the chance advantages of situation, though these have no "selective"
influence. The case of the tapeworm is illustrative.

His work, "Die organischen Regulationen, Vorbereitungen zu einer
Theorie des Lebens," 1901, is a systematic survey of illustrations
of the "autonomy" of vital processes. In his "Analytischen Theorie
der organischen Entwicklung," Leipzig, 1894, his special biological
("ontogenetic") views are still in process of development. But even
here his sharp rejection of Darwinism is complete (see VI., Par. 3,
on "the absurd assumption of a contingent character of
morphogenesis"). It is not for nothing that the book is dedicated to
Wigand and C. F. von Baer. He says that in regard to development we
must "picture to o