1. Burns, M. (1949). Studies on the follicles of sheep.J. Agric. Sci. 38, 303.
2. Dry, F. W. (1926). The coat of the mouse.J. Genet. 16, 287–340.
3. Fraser, A. S. (1951a). The growth of the mouse coat.J. Exp. Zool. 117, 1.
4. Fraser, A. S. (19516). Growth of wool fibres in sheep. (In preparation.)
5. Fraser, A. S. &Hamada, M. K. O. (1952). Observations on the birthcoats and skins of some British sheep (In preparation.)