“…The incubation period is very long, of the order of months (Bradley, loc. (500 c.c., equivalent of 25 grammes protein, preceded by 500 c.c. of 5 to 10 per cent glucose) for several days (Simon and Brown, 1946;Magee, 1946). Large doses of methionine (2.5 to 3 grammes orally) have also been found useful (Beattie and Marshall, 1944a;Beattie and Marshall, 19446;Beattie, 1946).…”