102 Scientific Intelligence. 
of dazzling white dry sulphocyanid of ammonium are obtained, which 
may be employed as a reagent, and for the same purpose as the sulpho- 
cyanid of potassium. Of the 2 oz. of sulphur added, 3 an oz. is left 
undissolved. 
e behavior of the higher sulphurets of ammonium towards prussic 
acid furnishes an admirable test for this acid. A couple of drops of a 
prussian blue, when mixed with a drop of sulphuret of ammonium an 
heated upon a watch-glass until the mixture is become colorless, yields 
a liquid containing sulphocyanid of ammonium, which produces with 
persalts of iron a very deep blood-red color, and with persalts of cop- 
per, in the presence of sulphurous acid, a perceptible white precipitate 
of the sulphocyanid of copper. 
3. Separation of Alumina from Oxyd of Iron.—Dr. W. Kuor (Jour. 
fir Prakt. Chem., Oct. 9, 1846,) states that he has effected a complete 
this way the alumina, on subsequent precipitation, is obtained on slow 
desiccation as a transparent mass, and on quickly drying and calcining 
it has so perfectly a white color as to leave no doubt of its being ex- 
tremely pure. 
4. Detection of minute traces of Alcohol ; (Monthly Jour. Med. Sci., 
Dec., 1846.)—Dr. R. D. THomson proposes in place of the distillation 
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