330 Prof. Armstrong, Dr. Armstrong, and Mr. Horton. [Apr. 2, 
hydrogen cyanide formed on digesting amygdalin with emulsin have been 
determined, the extent to which hydrolysis takes place, as measured by - 
means of the cyanide, has always been found lower than that measured 
by the amount of sugar produced—assuming this to be glucose—to an extent 
considerably beyond the probable error affecting the determinations. The 
following series of percentage values may be quoted in illustration :— 
Time. Rotatory power. | Hydrogen cyanide. Glucose. 
hours. 
1 146 9°9 16 °7 
3 33 °O 26 °7 35 °5 
5 44, °7 38 6 46 *1 
a 53 °7 48 °5 56 °7 
¢ 9 59 ‘9 56 °9 63 °9 
11 65°5 63 °3 69 -O 
25 76°8 80 °7 79 *1 
The experiment is one of the few in which it was found to be possible to 
determine the hydrogen cyanide by direct titration. It will be seen that 
the difference increases as the action proceeds, and then diminishes; the 
change indicated by the variation in rotatory power also rises to a maximum, 
and then diminishes. The relationship is more obvious in the following 
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