[29] Becquerel, P., Revue générale des Sciences, 1914, xxv., 559.

[30] Winogradsky, S., Beiträge zur Morphologie und Physiologie der Bacterien. Leipzig, 1888.

[31] Johannsen, W., Elemente der exacten Erblichkeitslehre. 2d ed., 1913.

[32] Murphy, J. B., Jour. Exper. Med., 1913, xvii., 482; 1914, xix., 181; xix., 513; Murphy and Morton, J. J., Jour. Exper. Med., 1915, xxii., 204.

[33] The reader is referred to Morgan’s book on Regenera­tion (New York, 1901), for the literature on this subject.

[34] Baur, E., Einführung in die experi­mentelle Vererbungslehre. Berlin, 1911, p. 232.

[35] Literature on this subject in Chapter IV.

[36] Loeb, J., King, W. O. R., and Moore, A. R., Arch. f. Entwicklngsmech., 1910, xxix., 354.

[37] Moenkhaus, W. J., Am. Jour. Anat., 1904, iii., 29.

[38] Loeb, J., Jour. Morphol., 1912, xxiii., 1.