[19] Kastle, J. H., and Loevenhart, A. S., Am. Chem. Jour., 1900, xxiv., 491.
[20] Taylor, A. E., Univ. Cal. Pub., 1904, Pathology, i., 33; Jour. Biol. Chem., 1906, ii., 87.
[21] Bradley, H. C., Jour. Biol. Chem., 1913, xiii., 407.
[22] This would lead to the idea that the enzymes in the cell also synthetize molecules of their own kind, or that, in other words, the synthetic processes in the cell are of the nature of autocatalysis. Loeb, Der chemische Character des Befruchtungsvorgangs, Leipzig, 1908. Robertson, T. B., Arch. f. Entwicklngsmech., 1908, xxv., 581; xxvi., 108; 1913, xxxvii., 497; Am. Jour. Physiol., 1915, xxxvii., 1; Robertson and Wasteneys, H., Arch. f. Entwicklngsmech., 1913, xxxvii., 485. Ostwald, Wo., Über die zeitlichen Eigenschaften der Entwicklungsvorgänge, Leipzig, 1908.
[23] Loeb, Leo, Jour. Med. Res., 1901, vi., 28; Arch. f. Entwicklngsmech., 1907, xxiv., 655.
[24] Loeb, Leo, Über die Entstehung von Bindegewebe, Leucocyten und rothen Blutkörperchen aus Epithel und über eine Methode isolierte Gewebsteile zu züchten. Chicago, 1897.
[25] While this has been demonstrated thus far only for connective-tissue cells it may be true also for other cells.
[26] Arrhenius, S., Worlds in the Making, London and New York, 1908, p. 212.
[27] White, J., Proc. Roy. Soc., 1909, B, lxxxi., 417.
[28] Macfadyen, A., Proc. Roy. Soc., 1903, lxxi., 76.