VITAMIN A frame, glazed with Crookes's "A" glass. This glass has the property of absorb- ing ultra-violet radiations of wave-length shorter than 3780 A., while trans- mitting 88 % of the visible light. Three doses, 02, 0*4 and 1.0 g., of each kind of spinach were given daily, except on Sundays.
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Hume et al. (1928) studied this question.
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