DAVENPORT, GERTRUDE C., and C. B. 1909. Heredity of Hair Color in Man. Amer. Nat., XLIII, 193-211 (April, 1909). DE VRIES, H. 1900. Das Spaltungsgesetz der Bastarde. Ber. der D. Bot. Ges., XVIII, 83-90 (14 March). 1902. Die Mutationstheorie. Versuche und Beobachtungen über die Entstehung der Arten im Pflanzenreich, Zweiter Band. I Lieferung, pp. 1-240. 1905. Species and Varieties: Their Origin by Mutation. Ed. by D. T. MacDougal. Chicago, 1905, xviii+847 pp. GOODALE, H. D. 1909. Sex and its Relation to the Barring Factor in Poultry. Science, XXIX, pp. 1004-1005. June 25. HARRISON, R. G. 1901. On the Occurrence of Tails in Man, with a Description of the Case reported by Dr. Watson. Proc. 14th Ann. Sess. Assoc. Amer. Anat., p. 141-158, 5 pls. HURST, C. C. 1905. Experiments with Poultry. In Report II to the Evolution Committee of the Royal Society (by Bateson _et al._). London, 154 pp. KEIBEL, F., and ABRAHAM, K. 1900. Normentafeln zur Entwicklungsgeschichte der Wirbelthiere. 2 Heft. Normentafel zur Entwicklungsgeschichte des Huhnes (Gallus domesticus). Jena, 1900, 132 pp., 3 Taf. LANG, A. 1908. Ueber die Bastarde von Helix hortensis Müller und Helix nemoralis L. Eine Untersuchung zur experimentellen Vererbungslehre. Jena, 120 pp., 4 Taf. LARRABEE, A. P. 1906. The Optic Chiasma of Teleosts: A Study of Inheritance. Proc. Amer. Acad. Arts and Sciences, XLII, 217-231 (Oct., 1906). LEWIS, T., and EMBLETON, D. 1908. Split-hand and Split-foot Deformities, their Types, Origin, and Transmission. Biometrika, VI, 26-58, pls. I-VII (March). LUTZ, F. E. 1908. The Inheritance of the Manner of Clasping the Hands. Amer. Nat., XLII, 195, 196 (March). MENDEL, G. 1866. Versuche über Pflanzen-Hybriden. Verhandlungen des naturforschen. Vereines in Brünn. Bd. IV, pp. 47. SCHWALBE, E. 1906. Die Morphologie der Missbildungen des Menschen und der Tiere. I. Th. Allgemeine Missbildungslehre. Jena, xvi+230 pp. SPILLMAN, W. J. 1909. The Nature of "Unit" Characters. Amer. Nat., XLIII, 243-248 (April). WRIGHT, L. 1902. The New Book of Poultry. London, etc., viii+600 pp. [Illustration: PLATE 1 Jungle Fowl, male, showing distribution of black and red elements of pattern. A. Hoen & Co. Baltimore. Kako Morita, pinx.] [Illustration: PLATE 2 Jungle Fowl, female, showing coloration and pattern. A. Hoen & Co. Baltimore. Kako Morita, pinx.] [Illustration: PLATE 3 White-faced Black Spanish, male. A. Hoen & Co. Baltimore. Kako Morita, pinx.] [Illustration: PLATE 4 First generation hybrid between White-face Black Spanish Cock and White Silkie Hen. A. Hoen & Co. Baltimore. Kako Morita, pinx.] [Illustration: PLATE 5 First generation hybrid between Black Minorca Cock and White Silkie Hen. A. Hoen & Co. Baltimore. Kako Morita, pinx.]