1. Alpatov, W. W. (1929). Growth and Yariatkm of the larvae ofDrosophila mdanogaster.J. Exp. Zool. 52, 407–37.
2. Gordon, C. &Sang, J. H. (1941). The relation between nutrition and exhibition of the geneantennaless (Drosophila mdanogaster).Proc. Roy. Soc. B,130, 151–84.
3. Gowen, J. W. &Johnson, L. E. (1946). On the mechanism of heterosis. I. Metabolic capacity of different races ofDrosophila mdanogaster for egg production.Amer. Nat,80, 149–79.
4. Haldane, J. B. S. (1949). Parental and fraternal correlations for fitness.Ann. Engen., Lond.,14, 288–292.
5. Hogben, L. T. (1933).Nature and Nurture. London.