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SELECTED ARTICLES. 
however, it readily crystallizes from its aqueous solution, and 
a small quantity, three grammes for example, dissolved in 
warm water, is sufficient to render a glass vessel containing 
two pints of water, perfectly opaque. This is owing to the 
crystallization of the phloridzine on the cooling of the fluid. 
This substance has been analyzed by M. C. Petersen, with 
results differing from those of Dr. De Koninck. 
0.301 gave 0.620 carbonic acid and 0.158 water 
0.239 0.492 0.125 
Or in the 100 parts 
I. II. 
Carbon 56.955 56.921 == 4 atoms 
Hydrogen 5.826 5.810 = 5 
Oxygen 37.219 37.274 = 2 
Phloridzine has been successfully employed by Dr. De 
Koninck in several cases of intermittent fever, in doses of 10 
or 15 grains. Journ. de Pharm. 
ART. XXXVT1I. — ON THE PROPERTIES OF DRY SULPHURIC 
ACID. By M. Aime. 
Within a short time past, a series of experiments have been 
given to the public, which have demonstrated the existence 
of a series of bodies of great importance in the study of 
Isomery, both from the facility with which they can be ob- 
tained and the decided character of their crystalline forms. 
These considerations induced me to try whether ether or al- 
cohol could not be formed from the carburetted hydrogen of 
marshes. To attain this, I attempted to collect this gas by 
means of hydrated sulphuric acid, hoping that as bicarburetted 
hydrogen might be transformed into ether by means of sul- 
phuric acid and barytes, that the same would take place with 
