[188] Boveri, Th., Verhand. d. phys.-med. Gesellsch. Würzburg, 1911, xli., 85. Schleip, W., Ber. d. naturf. Gesellsch., Freiburg i. Br., 1911, xix.

[189] Correns, C., Biol. Centralbl., 1916, xxxvi., 12.

[190] Baltzer, F., Mitteil. d. zoölog. Sta­tion, Neapel, 1914, xxii.

[191] Caullery, M., Les Problèmes de la Sexualité. Paris, 1913.

[192] Goodale, H. D., Biol. Bull., 1916, xxx., 286.

[193] Lillie, F., Science, 1916, xliii., 611.

[194] Janda, V., Arch. f. Entwcklngsmech., 1912, xxxiii., 345; xxxiv., 557.

[195] Goldschmidt, R., Proc. Nat. Acad. Sc., 1916, ii., 53; Ztschr. induct. Abstammungslehre, 1912, vii., and 1914, xi.

[196] This account of Marchal’s beautiful experi­ments is taken from Caullery, M., Les Problèmes de la Sexualité. Paris, 1913.

[197] Whitney, D. D., Science, 1916, xliii., 176.