* 
112 Correspondence of J. Nickiés. 
than what is necessary for the production of the chlorid, the renewal of 
the eee os decomposition, and the substitution, as soon as coo. 
of earthe n which cakes form from the double chlorid that flows 
The chlorid is decomposed in a reverberatory furnace, into which, 
mixed with bits of sodium, it is introduced. The reaction of the two 
substances takes place after a few moments, but so quietly that it may 
done = a large scale Without danger. It leaves the aluminium in 
plates, globules, or a powder. It is a from the common salt 
either mechanically or by means of wate 
rts that the cost of makin saciid! is at the most 7 francs 
a kilogram, sad od thet its manufacture is easier than that of phosphorus 
and also as simple as that of zinc. 
By acting on a mixture of carbonate of soda, carbon and chalk, the 
reaction is so complete that the result agrees with calculation, and so easy 
that we may substitute for the iron bottle commonly used, luted copper 
tubes. 
In the manufacture of sodium the carbon is now replaced by coal. 
Deville uses a coal which burns with considerable flame. It is important 
that the mixture should be we! — ried before subjected to decomposition. 
The proportions used are as : 
ee of ners . . - i RES 80 kil. 
oal, > - = a es aes, Ail 
E ghaltteds > voles elceey « 
The soda ought to be from the Prettiest aif the soda of the 
“ Bid gives bad results without Deville’s knowing precisely w y- 
gin of Urea in the Animal Economy.—Dumas has announced with 
Gch gif ott “ confirmation of his views icady old respecting 
the origin of urea in the animal economy, viz. that the urea proc 
from the sibamsnotd substances destroyed in the blood by an oes 
process. This is now established by M. Bechamp, Professor at the Schoo 
of Pharmacy of Strasbourg, who has succeeded in changing albumine 
fibrine and gluten into urea by a slow combination produced by means of 
a solution of 2 ey dean of potash at the temperature of about 80° C. 
The following is the proce 
fen grams of aluminum are dissolved in 300 grams of water; and to 
this by degrees 75 grams of permanganate of oes are ad :¢ 
reduction, which is at first ae active, soon ce It is then heated to 
40° C. in a water bath, and from time to time ports with pret uric 
; it de 
The alcoholic solution is evaporated in its turn to the consistence of 
honey and treated with hot hsotute alcohol which dissolves the urea. 
ilst A Bechamp was bringing out this transformation, a physiol 
ogist, M. Picard, made, also at Strasbourg, some observations bearing 0D 
the subject, having reference to the presence of urea in the blood and 
its diffusion th the system. : 
