[138] Braus, H., Münchener Med. Wochnschr., 1903, 1 (II.), No. 47, p. 2076.

[139] Nussbaum, M., Arch. f. mikroscop. Anat., 1886, xxvi., 485.

[140] It must not be overlooked that in bacteria and the blue algæ no distinct differentia­tion into nucleus and protoplasm can be shown. To these organisms, therefore, the experi­ments of Nussbaum cannot be applied.

[141] Loeb, J., Arch. d. f. ges. Physiol., 1893, lv., 525.

[142] v. Sachs, J., “Stoff und Form der Pflanzenorgane,” Gesammelte Abhandlungen, 1892, ii., 1160. Arbeiten a. d. bot. Inst. Würzburg, 1880–82.

[143] Goebel, K., Einleitung in die experi­mentelle Morphologie der Pflanzen, 1908.

[144] Loeb, J., Untersuchungen zur physiologischen Morphologie der Tiere. I. Heteromorphose. Würzburg, 1891. II. Organbildung und Wachsthum. 1892. Reprinted in Studies in General Physiology. Chicago, 1906.

[145] Gudernatsch, J. F., Zentralbl. f. Physiol., 1912, xxvi., 323; Arch. f. Entwcklngsmech., 1912, xxxv., 457; Am. Jour. Anat., 1914, xv., 431.

[146] Morse, M., Jour. Biol. Chem., 1914, xix., 421.

[147] Loeb, J., Arch. f. Entwcklngsmech., 1897, iv., 502.