9O DROSERA ROTUNDIFOLIA. Car. Vi. 
10 cub. cent. were measured out and evaporated, and dried at 
110° as before. The residues were respectively— 
“Tn the liquid containing hydrochloric acid 0:4079 
3 3s propionic acid -0-0601 
butyric acid 01468 
valerianic acid 0°1254 
a” a 
” a” 
“Hence, deducting from each of these the above-mentioned 
residue, left when the digestive liquid itself was evaporated, 
viz. 0'0031, we have, 
“For propionic acid .. .. as ..  0:0570 
» butyricacid .. .. ae .. 01487 
» Valerianic acid.. .. we .» 071228 
as compared with 0°4048 for hydrochloric acid; these several 
numbers expressing the quantities of fibrin by weight digested 
in presence of equivalent quantities of the respective acids 
under identical conditions. 
“The results of the experiment may be stated thus :—If 100 
represent the digestive power of a liquid containing pepsin with 
the usual proportion of hydrochloric acid, 14:0, 35-4, and 30-2, 
will represent respectively the digestive powers of the three 
acids under investigation. 
“5. In a second experiment in which the procedure was in 
every respect the same, excepting that all the tubes were 
plunged into the same water-bath, and the residues dried at 
115° C., the results were as follows :— 
* Quantity of fibrin dissolved in four hours by 10 cub. cent. 
of the liquid— 
“Propionic acid .. 2: «  0:0563 
Butyric acid... oe - 00835 
Valerianic acid .. rn «  0-0615 
“The quantity digested by a similar liquid containing 
hydrochloric acid was 0°3376. Hence, taking this as 100, the 
following numbers represent the relative quantities digested 
by the other acids: 
4 Propionic acid .. aie « 165 
Butyricacid .. be se 24-7 
Valerianic acid .. sa zs 161 
6. A third experiment of the same kind gave: 
