Chemistry and Physics. ‘3 4 109 
eee -bath, it furnished a brownish mass, a very small portion of which was 
- + deliquescent, the greater part consisting of the excess of carbonate 
-’ of soda, 
centrated sulphuric acid; and it was possible that in the present case 
the formic acid might have been produced by decomposition towards 
cap. he temperature is now cautiously and gradually raised, when a 
sufficient quantity of pure theine will be found to have collected on the 
r. 
aper. 
4. Test of the Presence of Sugar; (L’Institut, No. 846.)—M. Mav- 
mené has mentioned a new reagent for ascertaining the presence of 
Sugar in certain liquids. It is the bichlorid of tin. He announces his 
having observed, contrary to the statement of Liebig, that the chlorid 
acts On sugar even in the state. A temperature of only 100° C., is 
necessary for determining the reaction; and even in the cold it is pro- 
duced after some time. In either case it forms a brown matter partly 
x. 
