1. De Sanctis, A. G., Arch. Pediat., 39, 104 (1922).
2. Tweddell, F., Med. Record, N.Y., 100, 935 (1921).
3. Hess, A. F., J. Amer. Med. Assoc., 81, 15 (1923).
4. "Live Stock Policy of Board of Agriculture and Ministry of Food", J. Bd. Agric., 24, 1177–1180 (1918).
5. Leitch, I., and Godden, W., Technical Communication No. 14, p. 46, Imp. Bur. Anim. Nut. (1941).