444 Miscellaneous Intelligence. 
~ earried to the boiling point. The purification is finished by putting the 
liquid in contact with a solution of carbonate of baryta in carbonic acid. 
Mr. Melsens has also endeavored to decompose the carbonate of baryta 
and sulphate of soda by using high pressure furnished by a self-regulating 
machine. But no advantage has been found in this process. 
As the carbonate of baryta is poisonous, it is proposed to pulverize it 
after moistening it with a solution of sulphate of soda. The sulphate of 
baryta obtained in the process is employed either in the manufacture of 
paper, or for paints, this last a use not honest perhaps, but yet, in these 
days, of extensive application. ; 
7, Astronomical News—Paris Observatory.—The observatory at Paris 
continues td make progress. It is well known that it has two wings, an 
eastern and a western; on the former, in the time of Arago, a revolving 
chamber for observation was constructed, whose mechanism is a chef- 
d’euvre. The western wing is about to receive a telescope of the largest 
dimensions, at the expense of the government, and also an equatorial 
The objective of the telescope will be constructed with two disks of 
flint glass and crown glass, cast in the glass house of Chance & Co., 
fectly transparent and remelting them several times, they would not 
afford an objective over 40 centimeters in diameter. They were how- 
ever deemed i 
astronomically, but also with reference to its geology, 
a even history; and under these heads it treats 
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