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166 According to the empirical canon of physiology, that (as Frûˋdûˋricq expresses it) ãLãûˆtre vivant est agencûˋ de telle maniû´re que chaque influence perturbatrice provoque dãelle-mûˆme la mise en activitûˋ de lãappareil compensateur qui doit neutraliser et rûˋparer le dommage.ã

167 Such phenomena come precisely under the head of what Bacon called Instances of Magic: ãBy which I mean those wherein the material or efficient cause is scanty and small as compared with the work or effect produced; so that even when they are common, they seem like miracles, some at first sight, others even after attentive consideration. These magical effects are brought about in three waysã...ã[of which one is] by excitation or invitation in another body, as in the magnet which excites numberless needles without losing any of its virtue, or in yeast and such-like.ã Nov. Org., cap. li.

168 Monnier, A., Les matiû´res minûˋrales, et la loi dãaccroissement des Vûˋgûˋtaux, Publ. de lãInst. de Bot. de lãUniv. de Genû´ve (7), III, 1905. Cf. Robertson, On the Normal Rate of Growth of an Individual, and its Biochemical Significance, Arch. f. Entw. Mech. XXV, pp. 581ã614, XXVI, pp. 108ã118, 1908; Wolfgang Ostwald, Die zeitlichen Eigenschaften der EntôÙwickeôÙlungsôÙvorôÙgûÊnge, 1908; Hatai, S., Interpretation of Growth-curves from a Dynamical Standpoint, Anat. Record, V, p. 373, 1911.

169 Biochem. Zeitschr. II, 1906, p. 34.

170 Even a crystal may be said, in a sense, to display ãautocatalysisã: for the bigger its surface becomes, the more rapidly does the mass go on increasing.

171 Cf. Loeb, The Stimulation of Growth, Science, May 14, 1915.

172 B. coli-communis, according to Buchner, tends to double in 22 minutes; in 24 hours, therefore, a single individual would be multiplied by something like 10ÿ£¢²⁸ã₤; Sitzungsber. Mû¥nchen. Ges. Morphol. u. Physiol. III, pp. 65ã71, 1888. Cf. Marshall Ward, Biology of Bacillus ramosus, etc. Pr. R. S. LVIII, 265ã468, 1895. The comparatively large infusorian Stylonichia, according to Maupas, would multiply in a month by 10ÿ£¢⁴³ã₤.

173 Cf. Enriques, Wachsthum und seine analytisehe Darstellung, Biol. Centralbl. 1909, p. 337.

174 Cf. (int. al.) Mellor, Chemical Statics and Dynamics, 1904, p. 291.

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