BULLETIN OF THE BUSSEY INSTITUTION. 399 
residues either before or after they had been acted upon by the 1% acid, 
as will appear from the statements in the following list. 
Pentosans (or Mannans) in Residues left after the action of Malt. 
A. The bark of the Gray Birch tree felled in October gave 4.24% of 
‘«starch” when tested with malt extract, and there was got from the 
washed solid residue left after the action of malt 19.33% of furfurol, 
e., the solid residue contained 35.56% of pentosans. 
B. The outer wood of the Gray Birch tree felled in October gave 
3.51% of «*starch” to malt and the residue gave 17.75% of furfurol, 
é., 32.66% of pentosans. 
C. The outer wood of an Alder felled in January gave 3.04% of 
«« starch,” the residue therefrom being boiled with hydrochloric acid of 
1% gave 14.72% of pentosans and the residue from the action of the 1% 
acid gave 6.75% of furfurol, 7. e., 12.42% of pentosans, all calculated 
in this case on the original dry wood. 
D. Date Stones tested with malt extract gave (1) 5.44% and (II) 
4.79% of **starch.” The residue from No. I starch determination on 
being boiled with hydrochloric acid of 1% gave 11.65% of mannan and 
the residue from the 1% acid gave 3.38% of furfurol, 7. e., 6.22% of pen- 
tosans. All calculated on the original dry stones which of themselves 
had yielded 9.64% of pentosans when subjected to the furfurol test. 
E. Apricot Stones tested with malt gave 1.46% of «‘ starch” and the 
residue boiled with hydrochloric acid of 1% gave 14.07% of pentosans. 
The residue from the action of the 1% acid gave 9.57% of furfurol, 
7.e., 17.61 of pentosans. All calculated on the original dry stones. 
The sum of the pentosans obtained from the malt residue (14.07 + 
17.61 = 31.68) is almost as large as the quantity got, through furfurol, 
from the original wood (33.81%). 
F. The residue left after the action of malt on Peach Stones on 
being treated with hydrochloric acid of 1% gave 6.67'/, of pentosans and 
the residue from the 1% acid gave 9.65 of furfurol, 7. e., 17.96% of 
pentosans. All calculated on the original dry stones. 
Pentosans (or Mannans) in the Residues left after action of Hydro- 
chloric Acid of about 25%. 
From the residue left after the action of hydrochloric acid of about 
2.5% on the bark of the Gray Birch tree felled in May, there was 
obtained furfurol amounting to 6.53% of the original dry bark, 7. e. 
12.02% of pentosans. 
From the residue after the action of hydrochloric acid of about 2.5%, 
on the bark of the Gray Birch tree felled in July, there was obtained 
