98 The continuity of the phenomenon of growth, and the natural passage from the phase of increase to that of decrease or decay, are admirably discussed by Enriques, in ãLa morte,ã Riv. di Scienza, 1907, and in ãWachsthum und seine analytische Darstellung,ã Biol. Centralbl. June, 1909. Haller (Elem. VII, p. 68) recognised decrementum as a phase of growth, not less important (theoretically) than incrementum: ãtristis, sed copiosa, haec est materies.ã
99 Cf. (int. al.), Friedenthal, H., Das Wachstum des KûÑrpergewichtesã...ãin verschiedenen LebensûÊltern, Zeit. f. allg. Physiol. IX, pp. 487ã514, 1909.
100 As Haller observed it to do in the chick (Elem. VIII, p. 294): ãHoc iterum incrementum miro ordine ita distribuitur, ut in principio incubationis maximum est: inde perpetuo minuatur.ã
101 There is a famous passage in Lucretius (v. 883) where he compares the course of life, or rate of growth, in the horse and his boyish master: Principio circum tribus actis impiger annis Floret equus, puer hautquaquam, etc.
102 Minot, C. S., Senescence and Rejuvenation, Journ. of Physiol. XII, pp. 97ã153, 1891; The Problem of Age, Growth and Death, Pop. Science Monthly (JuneãDec.), 1907.
103 Quoted in Vierordtãs Anatomischeã...ãDaten und Tabellen, 1906. p. 13.
104 Unsere KûÑrperform, Leipzig, 1874.
105 No such point of inflection appears in the curve of weight according to C. M. Jacksonãs data (On the Prenatal Growth of the Human Body, etc., Amer. Journ. of Anat. IX, 1009, pp. 126, 156), nor in those quoted by him from Ahlfeld, Fehling and others. But it is plain that the very rapid increase of the monthly weights, apôÙproxôÙiôÙmateôÙly in the ratio of the cubes of the corôÙreôÙsponôÙding lengths, would tend to conceal any such breach of continuity, unless it happened to be very marked indeed. Moreover in the case of Jacksonãs data (and probably also in the others) the actual age of the embryos was not determined, but was estimated from their lengths. The following is Jacksonãs estimate of average weights at intervals of a lunar month: