1. Dobinski, S., NATURE, 138, 31 (1936).
2. Nelson, H. R., NATURE, 139, 30 (1937). Nelson considers the low-temperature oxide to be Fe3O4 ; the authors incline to -Fe2O3.
3. Evans, U. R., J. Chem. Soc., 2491 (1925) ; 1030 (1927) ; 101 (1929). Possibly the further development of the oxidation explains the slowly increasing resistance to a polluted atmosphere established by Vernon, W. H. J., J. Chem. Soc., 2279 (1926) ; Trans. Faraday Soc., 23, 127, 164 (1927).
4. Evans, U. R., and Bannister, L. C., Proc. Roy. Soc., A, 125, 378 (1929).
5. Constable, F. H., Proc. Roy. Soc., A, 117, 376, 385 (1927-28).