182 ADULTERATION OF CREAM OP TARTAR. 
to ascertain the best method of preparing this compound 
abundantly and economically. The apparatus used for 
this purpose consists of a cylinder of cast iron, eight inches 
in diameter and twenty-eight inches long. This cylinder is 
permanently closed at one end, and furnished with a cover, 
which is screwed on at the other end. Through the latter 
an iron tube, two inches in diameter, passes to near the 
bottom of the cylinder : this tube is furnished with an iron 
stopper at its upper extremity. There is also a wide tube 
connecting the top of the cylinder with a suitable refrigera- 
tor, and the lower end of the condensing tube of the refri- 
gerator is inserted into the mouth of a bottle containing 
some water. 
The iron cylinder is filled with wood charcoal, and is 
then placed in a suitable furnace ; when it has acquired a 
dull red heat some pieces of sulphur are introduced through 
the tube, which is then immediately closed with the stop- 
per. The sulphur is converted into vapour, which passing 
over the red-hot charcoal, combines to form the bisulphuret 
of carbon, and this is condensed in the refrigerator and col- 
lected in the bottle of water. With six pounds of charcoal 
and twenty or thirty pounds of roll sulphur, ten pints of 
the crude bisulphuret may be made in the course of six or 
seven hours.— -Ibid, from Journal de Pharmacic. 
ART. XL— ADULTERATION OF CREAM OF TARTAR. 
By Mr. James Grant. 
I \)eg through the medium of the Pharmaceutical Jour- 
nal, to call the attention of Chemists and Druggists to the 
adulteration of powdered cream of tartar, as it is, I believe, 
one of those articles which, from its cheapness, &c. is gene- 
rally supposed not to be worth sophisticating. A specimen 
obtained from one of the most respectable wholesale drug- 
