Vines. — Proteolytic Enzyme of Nepenthes {III). 573 
This suggestion gains in interest when it is borne in mind 
that tryptic digestion is of general occurrence in the animal 
kingdom, and is apparently the sole process in many inverte- 
brates. It is not improbable that it may be expanded into 
the proposition that tryptic digestion is a property of all 
living organisms, and that it is the more primitive form of 
the digestive process. 
List of Papers referred to. 
1 . Chittenden, Trans. Connecticut Acad., vol. viii, 1891. 
2 . Clautriau, La Digestion dans les Urnes de Nepenthes ; Mem. couronnes, 
Acad. roy. de Belgique, tom. lix, 1900. 
8. von Gorup-Besanez, Sitzber. d. phys.-med. Soc. zu Erlangen, 1876. 
4 . Hoppe-Seyler, Physiologische Chemie, 1878, p. 228. 
5 . Lawrow, Zeitschr. f. physiol. Chemie, Bd. xxvi, 1898, and Bd. xxxiii, 1901. 
6. Martin, Papain-digestion, Journ. of Physiology, vol. v, 1884. 
7 . Molisch, Studien lib. Milchsaft und Schleimsaft, 1901. 
8. Neumeister, Zeitschr. f. Biologie, Bd. xxvi, 1890, p. 329. 
9 . Stadelmann, ibid., p. 491. 
10 . Tiedemann und Gmelin, Die Verdauung nach Versuchen, 1831, Bd. i, 
PP- 3 1 ) 358 ; Bd. ii, PP- T 49 ’ 248, 272. 
11 a. Vines: The Proteolytic Enzyme of Nepenthes ; Ann. Bot., vol. xi, 1897. 
11 b. Ibid. vol. xii, 1898. 
12 . Zunz, Zeitschr. f. physiol. Chemie, Bd. xxviii, 1899, p. 171. 
