[477] In a series of "Beitraege zur Entwicklungsmechanik des Embryo," published in various journals from 1884 to 1891, all dealing with the frog's egg. Also in many papers in the _Archiv f. Entw. mech._, from 1895 onwards. [478] _Die Entwicklungsmechanik der Organismen, eine anatomische Wissenschaft der Zukunft_, Wien, 1890. [479] The first volume contains the important _Einleitung_ or general Introduction. [480] _Gesammelte Abhandlungen ueber Entwicklungsmechanik der Organismen_, 2 vols., Leipzig, 1895. [481] "Fuer unser Programm und seine Verwirklichung," _A.E.M._, v., pp. 1-80 and 219-342, 1897. "Ueber die Selbstregulation der Lebewesen," _A.E.M._, xiii., pp. 610-5, 1902. "Die Entwicklungsmechanik, ein neuer Zweig der biologischen Wissenschaft," Heft I. of the _Vortraege u. Aufsaetze ueber Entwicklungsmechanik der Organismen_, Leipzig, 1905. Oppel and Roux, "Ueber die gestaltliche Anpassung der Blutgefaesse," Heft x., of the _Vortraege u. Aufsaetze_, Leipzig, 1910. [482] "Ueber d. funkt. Anpassung des Muskelmagens der Gans," _A.E.M._, xxi., pp. 461-99, 1906. [483] The exact quantitative formulation of a _Wirkungsweise_ constitutes a law. The word itself is perhaps most conveniently rendered as "causal process." [484] M. Fuerbringer, perhaps under the influence of Roux, emphasised the importance, from a morphological point of view, of studying post-embryonic (functional) development, _Unters. z. Morph. u. Syst. der Voegel_, ii., Amsterdam, p. 925, 1888. [485] See, for the development of this idea, Oppel, in Roux-Oppel, 1910. [486] _Cf._ the controversy between Herbert Spencer and Weismann on the subject of "coadaptation" in the _Contemporary Review_ for 1893 and 1894. See also Weismann's paper in _Darwin and Modern Science_, Cambridge, 1909. [487] That is, the length they take up when separated from the body. [488] "Wilhelm Roux zum 60. Geburtstage," _Arch. f. Entw.-Mech._, xxx. _Festschrift fuer Prof. Roux_, Pt. i, 1910. [489] Virchow's _Archiv_, cxiv., 1888. First announced in Sept. 1887. [490] _Ueber die Bedeutung der Kernteilungsfiguren_, Leipzig, 1883. [491] _Bresl. aertz. Zeitschr._, 1885. [492] _Journ. de l'Anat. et de la Physiologie_, xxiii., 1887. [493] _Zeits. f. wiss. Zool._, liii., 1891 and 1892. [494] _Journ. Morph._, viii., 1893. [495] _Arch. f. Ent.-Mech._, i., 1895; ii., 1896. [496] _Arch. f. mikr. Anat._, xliii., 1893. [497] _Arch. f. Ent.-Mech._, iii., 1896. [498] _Arch. f. Ent.-Mech._, i., 1895. [499] _Anat. Anz._, x., 1895. [500] _Arch. f. Ent.-Mech._, iv. 1897. [501] _Arch. f. Ent.-Mech._, ii., 1896. [502] _Arch. f. Ent.-Mech._, iii., 1896. [503] _Journ. exper. Zool._, i., 1904. [504] _Unsere Koerperform_, p. 19, Leipzig, 1874.