96 Chittenden and Allen—Influence of various Salts 
Undigested Fibrin Relative proteo- 
K4Fe(CN) ¢+3H20. residue. digested, lytic action. 
0 0°3717 gram. 62°83 per cent. 100°0 
0°05 per cent. 0:5969 40°31 64:1 
0-10 0°7922 20°78 33°0 
0°25 0°9585 4°15 6°6 
0-5 10 0 0 
0 0°3098 69°02 100°0 
0-005 0°3562 64°38 93°93 
0°025 0°3471 65°29 94°5 
Potassium chlorate and Potassium nitrate. 
These two oxidizing agents produce almost exactly the same effect 
on pepsin-hydrochloric acid digestion; a retarding action directly 
proportional to the amount of salt present. 
Undigested Fibrin Relative proteo- 
KCl1O3. residue. digested. lytic action. 
0 0°2683 gram. 73°17 per cent. 100-0 
0°3 per cent. 0°4565 54°35 74°3 
0°8 07019 29°81 40% © 
15 0°8173 18:27 25°0 
30 0°87T07 12°93 17°6 
KNO3. 
0 0:2870 gram. 71:30 per cent. 100°0 
0°3 per cent. 0°5370 46°30 64°9 
0°5 0°6247 37°53 52°6 
0°8 0-7158 28°42 39°8 
15 0°8148 18°52 25°9 
3°0 0°8907 10°93 15°3 
With potassium chlorate no experiments have been previously 
tried; with potassium nitrate, however, Wolberg* experimenting 
with quantities varying from 0°5 to 8:0 per cent. found in every 
instance, diminution in the proteolytic action of his pepsin solution. 
This, however, amounted to but little, except in the presence of 8 grams 
(8 per cent.) of the nitrate, where there was a diminution in the 
amount of fibrin digested, equal to 490 per cent. Even with 6 per 
cent. of the salt, Wolberg found after 24 hours, only a diminution 
of 6°8 per cent. in the fibrin digested. 
In quantity, therefore, our results do not accord at all with Wol- 
berg’s, since as the table shows, even 0°3 per cent. of potassium nitrate 
caused a diminution in the quantity of fibrin digested, amounting to 
35°1 per cent., when compared with the control (100); while the pres- 
* Pfliiger’s Archiv, vol. xxii, p. 300. Ueber den Winfluss einiger Salze und Alka- 
loiden auf die Verdauung. 
