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Nutritional Disease. Doctors now fear above all else not germ plagues, but air raids and the scores of malnutrition diseases. These range from nerve destruction and insanity to sterility, night blindness, softening of the bones. Danes have not forgotten the terrible eye disease which swept their country in 1917, when they exported so much of their fresh butter, rich in Vitamin A. To forestall such eye trouble, margarine companies in Britain will fortify their products with the same proportion of vitamins found in butter.