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POPULAR SCIENCE REVIEW. 
porcelain or containing within it fragments of porcelain. There result from 
this process chloride of sulphur and bichloride of carbon, the latter being easily 
separated from the former by the action of potash. The bichloride of carbon, 
or chlorocarbon, is a transparent colourless fluid, having an ethereal and 
sweetish odour, not unlike chloroform. Its specific gravity is great, being as 
high as 1'56; chloroform is 1*49. It boils at 170° F., the boiling-point of 
chloroform being 141°. The density of its vapour is 5*33, that of chloroform 
being 4‘2. 
Simple Chemical Means of Cleaning Silver or Silver-plate. — This, which 
was suggested by Dr. G. Calvert, F.R.S., in the recent Cantor lectures, con- 
sists in plunging for half an hour the silver article into a solution made of 
1 gallon of water, 1 lb. hyposulphite of soda, 8 oz. muriate of ammonia, 4 oz. 
liquid ammonia, and 4 oz. cyanide of potassium ; but, as the latter sub- 
stance is poisonous, it can be dispensed with if necessary. The plate being 
taken out of the solution, is washed, and rubbed with a wash-leather. 
What is Antozone ? — It is, according to the opinion of M. Meisner, the 
fuming emanation from phosphorus. But, on the contrary, Schcenbein regards 
these vapours as being nitrite of ammonia, and other chemists look upon 
them as phosphorous acid. Experiments have recently been conducted 
by M. Osann, in order to clear up the whole subject. M. Osann passed 
these vapours into solutions of ammoniacal nitrate of silver and alkaline 
solutions of oxide of lead. In the first instance, a black precipitate 
was obtained, which contained on the average 97'28 of silver to 2‘72 of 
oxygen ; a constitution which gives it the formula of Ag 3 0. M. Osann at 
first thought that the oxygen contained in this precipitate was ozone, which, 
having more powerful affinities than ordinary oxygen, had displaced the latter 
in the oxide of silver ; but the oxidizing nature of ozone has caused him rather 
to attribute the formation of this body to a deoxidizing action, such as pro- 
duces antozone. He afterwards passed the same vapours, first into an alkaline 
solution of pyrogallic acid, to retain the ozone ; then partly into one of 
Woolfs bottles containing a little water ; partly into an ammoniacal solution 
of nitrate of silver : in this case the same precipitate was obtained, though 
all the ozone must have been absorbed by the pyrogallic acid. The water 
in Woolfs bottle, which had remained in contact with the vapours 
from the phosphorus, was shaken with blued tincture of guaiacum, which 
immediately lost its colour. The same thing happened with nitrate of 
ammonia and oxygenated water, but much more slowly with the latter, 
though it was highly concentrated. Hence M. Osann does not hesitate to 
say that in his experiment the decoloration was due to nitrate of ammonia, 
and consequently, he attributes the vapours produced during the slow com- 
bustion of phosphorus to the formation of this body. — Vide Journal fur 
Pract. Chemie, xcv. 55. 
