1. For example, Cowell, M. A. C., Brit. Emp. Cancer Campaign. Annual Report, p. 162 (1938).
2. Quimby, E. H., and MacComb, W. S., Radiology, 29, 305 (1937)
3. McWhirter, R., Brit. J. Radiol., 9, 287 (1936).
4. Cf. St. Rothman and Fr. Schaaf, "Handbuch der Haut u. Geschlecktskr." Berlin (1/2), 161–377 (1929); Wilkerson, V. A., J. Biol. Ckem., 107, 377 (1934); Schmid, R., Arch. f. Derm., 175, 493 (1937).
5. Caspersson, T., Skand. Arch. Physiol, Supp. 8 (1936).