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POPULAR SCIENCE REVIEW. 
gently boiled, a part at least of tbe sublimate will be dissolved. Some 
bisulphate of potash — either alone or mixed with some carbonate of soda and 
a little borax, the latter to prevent absorption — is then to be fused on charcoal 
in a reducing flame ; and the alkaline sulphide thus produced is to be 
removed by the point of the knife-blade, and placed in a small porcelain 
capsule. The hepatic mass is most easily separated from the charcoal by 
removing it before it has had time to solidify. Some of the tartaric acid 
solution is then to be dropped upon it, when the well-known orange-coloured 
precipitate of SbS 3 will at once result. 
The Volatile Hydro-carbons. — In a very important essay published in the 
Memoirs of the American Academy, Mr. C. M. Warjpn has endeavoured to 
prove the following serious statement : — 
1. That coal-tar naphtha contains only four hydro-carbons within the range 
of 80° to 170°, as taught by Mansfield and confirmed by Ritthausen. 
2. That the benzole series within that range of temperature is limited to 
four members, and, therefore, does not contain five, as generally supposed. 
3. That these four members have the boiling-points 80°, 110°, 140°, and 
170° respectively ; and, consequently, that the boiling-point difference in 
this series for an elementary difference of C 3 H 2 is 30° instead of 22° and a 
fraction. 
4. That the body obtained from coal-tar naphtha is not identical with 
curnole from cuminic acid, as assumed by Mansfield, nor even isomeric with 
it ; but that it has the formula which has been assigned to xylole, containing 
C 2 H 2 less than that of curnole. 
5. That the body obtained from coal-tar naphtha boiling at 170° is quite 
a different body from cymole from oil of cumin, these bodies differing from 
each other by C 3 H 3 . 
6. That curnole from cuminic acid, and cymole from oil of cumin, do not 
even belong to the benzole series. 
7. That the parabenzole of Church was in all probability only a mixture of 
benzole and toluole. 
The Preparation of Lime for Organic) Analysis. — A useful method has been 
described by M. Fausto Sestini, who impregnates the purest statuary marble 
with a thick syrup and then burns it. When the lime is causticised, he 
makes thin milk of lime in which any carbonaceous matter deposits. He 
then collects the lime on a filter, and washes well to remove any sulphide of 
calcium which may have been formed from sulphate in the marble. He then 
dissolves the lime in nitric acid, precipitates with carbonate of ammonia, and 
again burns the carbonate into quick lime. He thus obtains lime quite free 
from chlorine and sulphuric acid, and so adapted for use in the analysis qf 
organic bodies containing chlorine. — Vide Zeitschrift fur Anal. Chemie, 
part I. vol. IY. 
Manufacture of Arsenic Acid. — M. G-erardin’s method consists in sus- 
pending powdered arsenious acid in water, and passing chlorine into the 
mixture, by which means he obtains a clear solution of ^arsenic acid in solution 
in hydrochloric acid. By evaporating this solution, a mass of arsenic acid 
containing no trace of arsenious is procured. As it is difficult to keep any 
considerable amount of arsenious acid in suspension in water, the author finds 
it better to make a saturated solution of that acid in hydrochloric, and pass 
