460 BULLETIN OF THE BUSSEY INSTITUTION. 
ence of syrup which was treated with cold, strong alcohol in 
which some of it dissolved; hot alcohol dissolved little more of it 
than cold aleohol did. The dextrin-like residue insoluble in 
strong alcohol was dried at 70°C. until it ceased to lose weight. 
There was 0.299 grm. of it, which was dissolved in 50 ¢.c. water. 
The reducing power of this solution was tested carefully with 
Fehling’s liquor in comparison with that of a solution of pure 
dextrose. It appeared that while the reducing power of dextrose 
anhydride was 1, that of the matter insoluble in alcohol was 
0.4122. Ina previous trial, where the dextrin-like material had 
been prepared by a more circumstantial process, a reducing 
power of 0.2163 was observed, as has been said. 
It must be observed, however, that neither of these tests of the 
reducing power of the ‘* matter insoluble in alcohol” was wholly 
satisfactory. I am inclined to believe, indeed, that the use of 
lead carbonate for neutralizing the acid products of hydrolysis is 
inadmissible. The extremely high and manifestly abnormal rota- 
tory power of several of the ‘‘ dextrins”’ observed after the use 
of the lead carbonate make it evident that the results obtained 
after neutralizing with this agent are not directly comparable 
with those got by means of barium and ‘calcium compounds. 
Several chemists have called attention to the fact that by the 
action of one or another lead compound on sugar the rotatory 
power and other properties of the sugar may be changed, and it 
would seem that this remark must be true also of the case where 
lead carbonate is used for purposes of neutralization. It was 
very noticeable withal in my experiments that the syrups obtained 
by evaporation after the use of the lead carbonate were of de- 
cidedly darker color than those got by neutralization with calcium 
carbonate or barium carbonate or hydroxide; they were, in fact, 
very dark, and of unpleasant, molasses-like appearance. 
A satisfactory method of separating quantitatively the dextrose 
and ‘** dextrins”’ obtained on hydrolyzing cellulose from the acid 
and other matters with which they are admixed is still to be 
desired. 
E. Experiments in which pure Dextrose was treated with strong 
Sulphuric Acid. — In contrast with the foregoing observations on 
cotton, a few experiments were made by treating pure dextrose 
