on the Proteolytic Action of the Pancreatic Ferment. 113 
Potassium antimony tartrate. 
This compound of antimony fails to produce with trypsin the 
marked acceleration, noticed with the amylolytic ferment studied. 
This difference in action, since both ferments were in neutral solu- 
tion, indicates a specific difference in the nature of the two ferments. 
Following are the results obtained : 
Undigested Fibrin Relative proteo- 
K(SbO)C4H40¢. residue. digested. lytic action. 
0 0°3978 gram. 60°22 per cent. 100-0 
0-2 per cent. 9°4105 58°95 97°8 
0°5 0°4129 58°71 97-4 
1:0 0°4258 57-42 95°3 
15 0°5406 45°94. 76°2 
Ferric chloride and ferrous sulphate. 
With these two salts of iron the following results were obtained : 
Undigested Fibrin . Relative proteo- 
Fe2Clg. residue. digested. lytic action. 
0 0°5215 gram. 47°85 per cent. 100-0 
0°005 per cent. 0°5431 45°69 95°4 
0°025 0°6243 Sa 78°5 
0°050 0°7457 25°43 53:1 
0°100 10 ‘ 0 0 
FeSO4+7H20. 
0 0-4075 gram. 59°25 per cent. 100°0 
0°005 per cent. 0°4548 54°52 92-0 
0°05 0°6225 SIs 63°71 
0°10 O71T7 28°23 47°6 
0°25 0°7104 28°96 48°8 
0°50 0°7219 27°81 46°9 
1:00 0-7675 23°25 39-2 
1°50 0-7861 21°39 361 
Ferric chloride is seen to be far more energetic in its hindering 
action on the proteolytic ferment, than the ferrous salt. A like result 
was obtained with the amylolytic ferment of the saliva and to a 
lesser extent with pepsin-hydrochloric acid. 
Bubnow* has tried experiments with both of these salts and found, 
as might be expected, that when present to the extent of 5 per cent. 
they prevented the appearance of putrefaction products (indol, phe- 
nol, etc.) but did not interfere with the action of the unorganized 
ferment. As no quantitative results were obtained, we can make no 
direct comparisons. In our experiments, it is to be remembered that 
putrefaction is prevented by thymol. 
. * Zeitschrift fiir physiol. Chemie., vol. vii, p. 327. 
TRANS. Conn. ACAD., Vou. VII. fs} te OctT., 1886, 
