oo 
on the Proteolytic Action of the Pancreatic Ferment. 115 
Here retarding action is similar in extent to the action of 
barium chloride. Compared with ziné sulphate, the difference in 
action on trypsin is about the same in extent as the difference found 
in the action of the two salts on the amylolytic ferment of saliva. 
The retarding action of this salt on pancreatic digestion has been 
previously noticed by Pfeiffer.* 
Potassium permanganate. 
The retarding action of potassium permanganate 1s very pro- 
nounced. There is, however, a noticeable difference between the 
action of the salt on trypsin and its action on pepsin and ptyalin, the 
two latter being much more readily affected by the permanganate ; 
that is, by much smaller percentages. 
Undigested Fibrin Relative proteo- 
KoMn2O0g. residue. digested. lytic action. 
0 0°4562 gram. 54°38 per cent. 100°0 
0-001 per cent. 0°4570 54°30 99°8 
0:003 0:4608 53°92 SEAL 
0-010 0°4833 51°67 95°0 
0 03675 "63°25 100-0 
01 0:4487 55:13 87-1 
0°5 07769 22°31 35°2 
10 1:0 0 0 
Potassium dichromate. 
Undigested Fibrin Relative proteo- 
KoCr207- residue. digested. lytic action. 
0 0°3978 gram. 60°22 per cent. 100-0 
0°05 per cent. 0°4032 59°68 fer 
0:2 0°4245 57°55 95°5 
0°5 04693 53°07 88:1 
1:0 0°5525 44°75 74:3 
15 0°6321 36°79 61°0 
The retarding action of this salt is proportionally greater than 
that of the other potassium salts, indicating that the acid has a 
specific action of its own. Moreover, being an acid salt, the acid radi- 
cal is present in larger amount than in the neutral potassium salts 
experimented with. 
Potassium cyanide. 
The very pronounced acceleration in proteolytic action caused by 
the larger percentages of this salt is very interesting, especially when 
we recall the fact, that the retarding action of the same salt on the 
* Centralbl. med. Wiss., 1885, p. 328. 
