[166] Chittenden: On the Proteolytic Action of Bromelin, the Ferment of Pineapple Juice. Journal of Physiology, vol. 13, p. 303.

[167] Weitere Untersuchungen über die Proteine des Tuberculins. Zeitschr. f. Biol., Band 30, p. 221.

[168] Chittenden and Cummins: Studies in Physiol. Chem., Yale University, vol. i., p. 135.

[169] Mays: Untersuchungen aus d. physiol. Institute d. Universität Heidelberg, Band iii., p. 378; also Langley: On the Destruction of Ferments in the Alimentary Canal, Journal of Physiology, vol. iii., p. 263.

[170] R. Neumeister: zur Kenntniss der Albumosen. Zeitschr. f. Biol. Band 23, p. 378.

[171] Jac. G. Otto: Beiträge zur Kenntniss der Umwandlung von Eiweissstoffen durch Pancreas-ferment. Zeitschrift f. physiol. Chem., Band 8, p. 129.

[172] Kühne and Chittenden: Studies in Physiol. Chem. Yale Univer., vol. ii., p. 40.

[173] J. Otto: Zeitschr. f. physiol. Chem., Band 8, p. 146.

[174] Kühne and Chittenden: Zeitschr. f. Biol., Band 19, p. 196.

[175] Chittenden: Studies in Physiol. Chem. Yale Univer., vol. iii., p. 101.