of Sugar in the Liver, in the presence of Peptones. 199 
arterial. At the end of this time further action was prevented by 
boiling the mixtures, after which they were extracted in the usual 
manner. Neither of the two extracts contained enough glycogen for 
estimation. Following are the other results : 
Sugar A. 
Volume Equivalent Total Per 
used. Weight of Cu. in dextrose. amount.. cent. 
25 ¢. ¢. 0°1710 gram. 0-0874 gram. 0°3496 gram, 1-74 
After boiling with dilute H.SO,. 
25 C. C. 0°1730 gram, 0°0885 gram. 0°3540 gram. Alita 
. Sugar B. 
25 ¢. Cc. 0°1638 gram. 0°0837 gram. 0°3348 gram. 1°67 
After boiling with dilute H.SO.. 
25 ¢. ¢. 0°1750 gram. 0°0895 gram. 0°3580 gram. eae, 
Totul carbohydrates A. 
25 ©. ¢. 0°1048 gram. 0°0533 gram. 0°4264 gram, 2°13 
Total carbohydrates B. 
25 ¢.¢. ~ 0°0930 gram. 00474 gram. 0°3792 gram. 1:89 
Sugar. 
Amount of Gly- Before After Total 
liver taken, Method of treatnient. cogen. boiling. boiling. carbohydrates. 
50 grams. With peptones and blood (A), 0 74% lig 2°13 % 
50 Without peptones and blood (B), 0 1°67 Hee 1°89 
+007 —002 +0°24 
In the presence of peptone, there is to be noticed a slight increase 
in total carbohydrates, which increase receives confirmation from 
the fact that in A, the total carbohydrates exceed the sugar by 0°5 
per cent., while in B the difference after boiling the sugar with dilute 
acid is but 0°1 per cent., probably within the limits of error. It is 
to be noticed, moreover, that in the presence of peptone, the sugar 
formed is wholly dextrose, its reducing power not being materially 
changed by boiling with dilute acid, whereas in B there is a slight 
increase in reducing power on boiling with acid. If the difference is 
sufficient to warrant any explanation it might be suggested that 
peptone by its presence* stimulates the ferment which presumably 
converts maltose into dextrose and thus in A complete conversion 
was effected sooner than in B. 
Eaperiment X. 
This experiment was like the preceding, with the exception that 
the cat employed was not in full digestion. The stomach was nearly 
* Compare Chittenden and Smith, Trans. Conn. Acad., vol. vi, p. 343. 
