20, 2 Brill and Brown: Philippine Papain 191 
had lost their activity at the end of seven years. Sodium 
chloride shows first a slightly activating effect, followed by an 
inhibiting effect in more-concentrated solutions. Sodium car- 
bonate, sodium bicarbonate, calcium chloride, magnesium sul- 
phate, and boric acid have no marked influence; potassium 
chloride and sodium citrate showed marked activating influence; 
while acetic acid and lactic acid, contrary to the findings of 
Vines*® and of Mendel and Blood® with hydrocyanic, a weak 
organic acid, showed strong inhibiting effects. 
5’ Am. Bot. 17 (1902) 606. 
* Journ. Biol. Chem. 8 (1910) 182. 
