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2. Fisher, L: The influence of flesh-eating on endurance, Yale Med.

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3. Kellogg, J. H.: Diet as a means of increasing vital resistance in tuberculosis with special reference to the protein ration, Med.

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4. Slonaker, J. R.: Effect of vegetarian diet on spontaneous activity, rate of growth and longevity of the albino rat, Leland Stanford Junior Publications, University Series, 1912.

5. McCollum, E. V., Simmonds, N., and Pitz, W.: The vegetarian diet in the light of our present knowledge of nutrition, Amer. Jour. of Physiol., 1916, xli, 333.

6. McCollum, Simmonds, and Pitz: The supplementary dietary relationship between leaf and seed as contrasted with combinations of seed with seed, Jour. Biol. Chem., 1917, xxx, 13.

7. Evvard, J. M.: Is the appetite of swine a reliable indication of physiological needs? Proc. Iowa Academy of Sciences, 1915, xxii, 375.

8. McCollum, and Simmonds: Unpublished data.

9. Loeb, J.: The dynamics of living matter, New York, 1906.

Howell, W. H.: An analysis of the influence of the sodium, potassium and calcium salts of the blood on the automatic contractions of heart muscle, Amer. Jour. Physiol., 1901, vi, 181. Howell, W. H.: Vagus inhibition of the heart in its relation to the inorganic salts of the blood, Amer. Jour. Physiol., 1906, xv, 280. 10. Holding, H. W.: Personal communication.