[64] The pressure experiments and the dislocation experiments come into account here; for the sake of simplicity they have not been alluded to in the main line of our argument.
[65] My “first proof of vitalism” was first developed in the paper, “Die Localisation morphogenetischer Vorgänge,” Leipzig, 1899. (See additional remarks in Organische Regulationem, Leipzig, 1901, and in Archiv für Entwickelungsmechanik, 14, 1902.) I cannot admit that any really serious objection has been brought forward against it. (See my articles in Biologisches Centralblatt, 22, 23, 27, and in Ergebnisse d. Anat. u. Entwickelungsgesch. 11, 14.) An historical sketch of vitalism will be found in my book, Der Vitalismus als Geschichte und als Lehre, Leipzig, 1905.
[66] We are dealing here with morphogenesis and so-called vegetative physiology only; to certain psychologists, who have refuted the theory of psycho-physical parallelism, I must grant that they also have proved vitalism. (See Volume II.)
[67] The eight larvae would be incomplete in some respect, but not with regard to symmetry. They would be “whole” ones, only showing certain defects in their organisation. See page [65] note [17], and page [73].
[68] Reciprocal harmony may be reduced in some cases to the given proportions of one original harmonious system, from which the single constituents of the complicated system, showing reciprocal harmony, are derived. Then we have only an instance of “harmony of constellation” (see p. [109]). But reciprocal harmony seems to become a problem itself, if it occurs in restitutions starting from quite a typical point, selected by the experimenter. It will be a problem of future research to give an exact formula of what happens here. Reciprocal harmony also occurs in regeneration proper. It is known that the formation of the regenerative bud and the differentiation of this bud follow each other. As the bud is composed of different elementary systems, it follows that these different systems, of which every single one is harmonious, also have to work in reciprocity to each other, in order that one whole proportionate formation may result.
[69] Biol. Centralblatt. 23, 1903.
[70] Certain phenomena of the physiology of growth of Geranium Robertianum, recently discussed by Francé from a vitalistic point of view (Zeitschr. Entw. lehre. 1, 1907, Heft iv.), might also belong here. I cannot see an independent proof of vitalism in these facts if taken by themselves; a pre-existing “machine” cannot be absolutely excluded here.
[71] Driesch, Arch. Entw. Mech. 5, 1897.
[72] Driesch, Arch. Entw. Mech. 14, 1902.
[73] The root may be restored by regeneration proper, or by the production of adventitious roots, or by one of the side-roots changing its geotropism from horizontal to positive, according to the smaller or greater distance of the wound from the tip.