1. de Fremery, Laqueur, Reichstein, Spanhoff, Uyldert, NATURE, 139, 26 (1937).
2. This formula was not published, but deposited in a Swiss patent filed December 1936.
3. Kendall, Mason, Hoehn, McKenzie, Proc. Staff Meet. Mayo Clinic, 12, 136 (1937).
4. Mason, Myers, Kendall, J. biol. Chem., 114, 613 (1936).
5. Kendall, Mason, Myers, Proc. Staff Meet. Mayo Clinic, 11, 361 (1936).