Chemistry and Physics. 217 
necessary to extinguish it. To apply it to volumetric analysis, as 
or example to the determination of dextrose by Fehling’s solu- 
tion, he would proceed as follows: Add to a measured volume of 
od are: Ist, 
It does not depend for its accuracy upon a definite, p ermsaerpie’ 
i 
mined at the time of use. 3d, The small volume of the liquid 
(about two cubic centimeters) which is required. 4th, It admits 
method, a long practice with it in order to obtain exact results. 
Results of the use of the method are given which are closely * 
accordant and quite satisfactory.—Liebig’s Annalen, clxxvil, 31, 
May, 1875, G. F. B. 
6. Fluorene and fluorene Alcohol.—Barzizr, having shown 
— fluorene—a hydrocarbon first obtained by Berthelot from 
| 
m 
de of the carbonyls as first pointed out by Berthelot. 
from boiling benzol, appears as hard white hexagonal pies 
coho 
C,,H,(CO)4H,=0, ,H,(CH,0)=C,,H,(CHOH). 
It melts at 153°, and is oxidized by chromic acid to diphenylene 
carbonyl again. When heated for some time above its fusing 
point, it loses water and yields fluorene ether, which melts at 
n 
(C,,H,, CH),O. When the alcohol is heated with acetic oxide 
(c 100° for eight hours, an aceto-fluorene ether (0, H,, 
Fluorene alcohol is the first alcohol discovered which loses water 
