: 194 Miscellanies. 
erty. The heat produced during the operation has certainly nothing 
to do with it, for the experiment succeeds equally when the vessel is 
placed in a freezing mixture.—Idem, Dec. 1830. 
17. Preparation of Bromine and its Hydrate-—({Ann. der Phys.) 
—The mother liquors containing bromine are to be evaporated to a 
fourth of their volume in iron pans, and then left for several days; 
in which time the larger part of the chloride of calcium crystallizes. 
The supernatant liquor, being diluted with water, is to be mixed with 
sulphuric acid as long as a precipitate is formed. 'The liquid portion 
being separated, and the solid residue pressed, all the fluid is to be 
mingled and evaporated to dryness, and then redissolved, that a cer 
tain quantity of sulphate of lime may be removed. On acting upon 
the solution by sulphuric acid and peroxide of manganese, and then 
distilling, bromine is obtained.—Idem. 
18. Hydrate of Bromine.—This compound is easily formed ata 
temperature of from 39° to 43° Fahrenheit, by making the vapor of 
romine pass into a tube moistened with water; in about a quarter of 
an hour the tube is filled with solid hydrate—(Ann. de Phys. XIV. 
485. Roy. Inst. Journ. April 1830.)—Idem. 
19. New process for obtaining Lithia.—M. Quesneville jun. gives 
the following as his method of separating Lithia. “I take one pat 
of levigated Triphane, and mix it accurately with two parts of pow- 
dered litharge: I put the mixture into a crucible, and expose it to 4 
white heat. In about a quarter of an hour the mass is perfectly fluid: 
I then cool it and powder it finely: I afterwards act upon it by 
tric acid, the silica separates in a very divided state ; I precipitate all 
the nitrate of lead by sulphuric acid, and evaporate to dryness to ¢* 
pel all the nitric acid. I afterwards treat it with water, and precip 
tate the alumina and other metallic oxides by ammonia, and then adil 
earbonate of ammonia to precipitate the lime and magnesia; the 8° 
lution is then filtered and evaporated to dryness. The mixture is 10 be 
strongly calcined to expel all the ammoniacal salts; this operat? 
must not be performed in a platina crucible, as it would be acted = 
on; [use a porcelain one. ‘The calcined residue is to be treated with 
water, and all the sulphuric acid precipitated by barytes; the ater 
liquor when evaporated gives pure lithia.”—(Jour. de Pharmacié 
April, 1830.)—Jdem. 
20. On Powdering Phosphorus.—M. Casaseca remarks, that the 
method of pulverizing phosphorus, mentioned by all chemical authors: 
