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2. Bechdel, S. I. The relation of vitamin A to the nutritive value of cottonseed meal. Penna. Exp. Sta. Bull. 266, p. 19.
3. The vitamin B requirements of the calf;Bechdel;J. of Dairy Sc.,1926
4. Bechdel, S. I., Williams, P. S., and Skaggs, S. R. Penna. Exp. Sta. Bull. 308, p. 17.
5. The quantitative estimation of carotene in blood and tissues;Conner;J. of Biol. Chem.,1928