188 
This is the per cent of glycerin combined with the soluble acids of the 
hard portion. 
The difference between the per cent of glycerin combined with the 
per cent of soluble acids of the soft portion and the per cent of glycerin 
combined with the per cent soluble acids of the hard portion, then, is 
2.14—1.61=.53%. This agrees closely with the difference of the glycerin 
between hard and soft portions as shown by analyses. (See Table VI.) 
The per cent of glycerin combined with the insoluble acids is nearly 
the same in both soft and hard portions, because the per cent of in- 
soluble acids in the soft and hard portions differs very little. Also the 
variation in the composition of the insoluble acids would not materially 
affect the molecular weight. Therefore, it is reasonable to expect that 
nearly the same per cent of glycerin is combined with the insoluble acids 
of both the soft and the hard portions. 
