412 BULLETIN OF THE BUSSEY INSTITUTION. 
quantity similar to that used in the cold, and the analysis was 
proceeded with as before. There was found in this case 3.37% 
of wood-gum which was but little more than had been dissolved 
out by the cold soda lye, and 25.55% of lignic acids, 7. e. more 
than was wot in the preceding trial, and 49.47% of cellulose. 
The amount of wood-gum obtained from the peach stones, 
2.99% and 3.37%, is noticably small in view of the fact, that 
on distilling the powdered stones for furfurol 15.02% of this 
substance was obtained, which is the equivalent of 27.64% of 
pentosans. 
With the exception of the anomalous result (66.71%) in the 
case where the material had been digested in cold soda lye, before 
the fusion with caustic potash, it will be seen that the percentage 
of ‘‘ cellulose” obtained from peach stones by Lange’s method is 
a fairly constant quantity, though the large proportion of furfurol 
obtained on distilling this so called cellulose with hydrochloric acid 
goes to show that the material is far enough from being pure. 
The indications are that it is combined with a large proportion of 
pentosans. It will be noticed also, that while, generally speaking, 
in the foregoing trials a low percentage of cellulose is accompanied 
with a high percentage of lignic acids — thanks probably to the 
more or less effective action of the caustic potash in the different 
instances — it cannot be said that the quantities of cellulose and 
lignic acids are complementary. On adding together the percent- 
ages of cellulose, wood-gum and lignice acids, it will be seen that 
the sums total differ to no inconsiderable extent in the several 
instances. It would appear that more or less of the original 
material has actually been destroyed, 7. e. dissipated by the hot 
alkali. 
It is worthy of remark that on treating the peach stones with a 
mixture of nitric and sulphuric acids, less cellulose was obtained 
than was got by means of Lange’s process. Thus, a quantity 
of powdered peach stones (15 grm.) was digested, according to 
Lifschtitz, for 16 hours at a temperature of 45° to 50° C. with 10 
or 12 times its weight of a mixture of 1 volume of concentrated 
sulphuric acid and 3 volumes of nitric acid of 1.2 sp. gr., and 
then washed successively with cold water, hot water, a warm 
dilute solution of sodium carbonate, and again with hot water. 
On drying and weighing this cellulose it was found to amount to 
ng ee ee 
