[50] Amer. Journ. Physiol., Vol. 2, 1898, p. 47.

[51] Amer. Journ. Physiol., Vol. 2, 1898, p. 82.

[52] Festschrift f. Fick, 1899. Chicago Decennial Publications, 1902, and Pflüger’s Archiv, Bd. 91, S. 248, 1902. Amer. Journ. Physiol., Vol. 5, 1901.

[53] Amer. Journ. Physiol., Vol. 4, p. 265, 1900; Vol. 8, p. 75, 1902.

[54] Pflüger’s Archiv, Bd. 6, 1872; and Bd. 8, 1874.

[55] MacCallum, J. B.: Journal exp. Zoology, No. 1, 1905.

[56] Stover, F. H.: Bulletin of Bussey Institution, Vol. II, Part IV, 1884.

[57] MacCallum, J. B.: Journal Exp. Zoology, Vol. I, No. 1, 1904.

[58] MacCallum, J. B.: University of California Publications, Physiology, Vol. II, 1905, p. 93.

[59] MacCallum, J. B.: Loc. cit.