‘ 
406 Remontoire Esscapement for an Astronomical Clock. 
When the stomach had completely disappeared, which took 
place in less than half an hour, some hydrochloric acid was added 
and the heat continued fora few minutes longer. ‘The liquid was 
now ready for filtration and left upon the filter only a few flakes 
of organic matter, together with a little fat and that portion of 
the contents of the stomach which was insoluble in hydrochloric 
acid. It may be here noticed that a piece of paper which had 
been improperly wrapped around the stomach by those who sent 
it, and which could not be separated from it, also a cotton string 
which had been tied around it by the same parties, were also 
completely destroyed by the bromine. 
In the filtrate, arsenic, antimony, mercury, etc., were searched 
for by the usual methods. 
To preclude all fear of fallacy in this process, I may add that 
an experiment was made to ascertain whether the volatility of 
the a of arsenic, antimony, and mercury could influence 
the resu 
A liquid which contained just detectable traces of arsenious 
acid, tartar emetic and corrosive sublimate, was evaporated to 
dryness in the ieaciate of a large excess of bromine. In the res- 
idue were still easily detected arsenic, antimony and mercury. 
This result does not, of course, touch the question whether arsenic 
and antimonic acids are volatilized like phosphoric acid, by evap- 
oration of their acid solutions, either without decomposition or 
as so ie or quingnibromids of arsenic and antimony, the de- 
cision of w ould require many special experiments. 
In fact, he ie porns of Dupasquier, which have an indirect 
bearing are this question, show that arsenious acid when evap- 
orated int resence of a large quantity of hydrochloric acid, 
may be entirely volatilized, probably as terchlorid of arseni ic. 
Dr. Wolcott Gibbs recently informed me ~ t he has had occa- 
sion to confirm this observation of Dupas 
The boiling points, however, of the abril of arsenic and 
antimony are “quoted at 428° and 518° F., respectively, while the 
chlorids of the same metals boil at 270° and 446° I*., which facts 
evidently render the chance of loss in the bromine " process ke 
than in the old processes. 
. Ann, XLIX—On an Improved Remontoire Escenas for an 
Astronomical Clock ; by J. Fur 
i asimple pendulum, vibrating seconds in a very ‘small are, 
ae loss will be according to the extent of the arc fie = on Mgt 
ae point of rest, as shown there. 
* ee Se ii, 709. 
e to describe any of the arcs in the following table, ict) : 
ee 4 
