422 Journal of Agricultural Research voi. iii. no. s 



LITERATURE CITED 

 (i) Curtis, M. R. 



1914. A biometrical study of egg production in the domestic fowl. IV. Factors 

 influencing the size, shape, and physical constitution of eggs. In 

 Arch. Entwicklungsmech. Organ., Bd. 39, Heft 2/3, p. 217-327, pi. 6-10. 

 (2) Donaldson, H. H. 



1908. A comparison of the albino rat with man in respect to the growth of the 

 brain and of the spinal cord. In Jour. Compar. Neurol, and Psych., 

 V. 18, no. 4, p. 345-389- 



(3)- 



(4) 



1909. On the relation of the body length to the body weight and to the weight 

 of the brain and of the spinal cord in the albino rat (Mus norv-egicus 

 var. albus). In Jour. Compar. Neurol, and Psych., v. 19, no. 2, p. 



155-167. 



1910. On the percentage of water in the brain and in the spinal cord of the 

 albino rat. In Jour. Compar. Neurol, and Psych., v. 20, no. 3, p. 119- 

 144. 



(5) — 



191 1. On the regular seasonal changes in the relative weight of the central 

 nervous system of the leopard frog. In Jour. Morph. , v. 22, p. 663-694. 



(6) and HaTai, Shinkishi. 



igii. A comparison of the Norway rat with the albino rat in respect to body 

 length, brain weight, spinal cord weight, and the percentage of water 

 in both the brain and the spinal cord. In Jour. Compar. Neurol, and 

 Psych., v. 21, p. 417-438. 



(7) Elderton, W. p. 



1907. Frequency-curves and correlation. 172 p. London. 



(8) Hatai, Shinkishi. 



1909. Note on the formulas used for calculating the weight of the brain in the 

 albino rats, /m Jour. Compar. Neurol, and Psych., v. 19, no. 2, 169-173. 



(9) 



191 1 . A formula for determining the total length of the leopard frog (R. pipiens) 

 for a given body weight. In Anat. Rec, v. 5, no. 6, p. 309-312. 



1911. An interpretation of growth curves from a dynamical standpoint. In 

 Anat. Rec v. 5, no. 8, p. 373-382. 



(11) Holstein-Friesian Association of America. 



1913. The advanced registry year book. v. 24, 1004 p. 



(12) Holtsmark, G. 



1904. [On the relation of milk yield and feed consumption.] In Arch. Math, 

 og Naturvidensk, v. 26, no. 2. (Cited from Exp. Sta. Rec, v. 16, 



P- 59I-) 



(13) Lewenz, M. a., and Pearson, Karl. 



1904. On the measurement of internal capacity from cranial circumference. 

 In Biometrika, v. 3, pt. 4, p. 366-397, pi. 2-3. 



(14) Pearl, Raymond. 



1909. Studies on the physiology of reproduction in the domestic fowl. I. Regu- 

 lation in the morphogenetic activity of the oviduct. In Jour. Exp. 

 Zool., V. 6, no. 3, p. 339-359, 2 fig. 



(15) 



1914. On the law relating milk flow to age in dairy cattle. In Proc. Soc. Exp. 



Biol, and Med., v. 12, no. i, p. 18-19. 



(16) and McPheters, Lottie E. 



1911. A note on certain biometrical computations. In Amer. Nat., v. 45, 

 no. 540, p. 756-760. 



(17) • with the assistance of Pepper, Olive M., and H.\GLE, Florence J. 



1907. Variation and differentiation in Ceratophyllum. 136 p. Washington, 

 D. C. (Carnegie Inst. Washington, Pub. 58.) 



(18) Pearson, Karl. 



1895. Mathematical contribution to the theory of evolution. II. Skew vari- 

 ations in homogeneous material. In Phil. Trans. Roy. Soc. London, 

 s. A., v. 186, p. 343-414, 10 pi. 



(19) 



1899. On certain properties of the hypergeometrical series, and on the fitting 

 of such series to observation polygons in the theory of chance. In 

 Phil. Mag. and Jour. Sci., s. 5, v. 47, no. 285, p. 236-246. 



