Alexandria gazette. [volume] (Alexandria, D.C.) 1834-1974, 1872-10-28

brought to certain definite volume ounces
| think this gave me solution of which this
is part (here holding up fluid I'M small vial
it was about ounces; used the English gradu-
ates in measuring that solution would contain
arsenic if any were present; it would contain
chlorate potash. distilled water and muriatic
acid, and whatever water may be distilled; hav.
ing obtained this solution, tested Tor mineral
poison: half of this solution was taken; this was
treated with sulphurous acid prepared BY hea-
ting copper turhings with sulphurc acid; be,
fore making up this solution it was evaporatedi
down to take off smell; passing sulphnrous ACID
through one half would convert arsenic into ar
scnious acid, fany were esent:eTaporatingth TINS
solution down to very nearly dryness until all
the smell Of sui phurous acid was gwen on; some
distilled water was then added to increase
the quantity solution put IN different glass
and a stream of washed sulphureted hydrogen
| passed through solution, which was gently
heated, after passing through Tor about one
and a half to two hours; the precpltate was
allowed to stand, at least, for six or eight hours
that precpitate was filtered, separated from
| onid) washed with water containing little
| sulphureted hydrogen, and then with distilled
water, and the filter paper was spread
out in dish and heated with little water and
aqua ammonia the object Of treating with
ammonia was to dissolve any sulphide OF arsenic:
If any arsenic was present it would be IN the
form of sulphide and the ammonia would
take up the sulphide Of arsenic, leaving any or
all of the other metal that would give yellow
or orange red precpltates that gave me
brown solution and a residue on the filter
which when dried gives this brownlsh powders;
there producing residue undissolved in ammo
NAL now this brown liquid solution in ammo
MIA was evaporated to dryuess over water
bath now if there were arsenic present the
object of treatment is to get free solution
| from organic matter, clear coloress evaporated
to drvness then nitric acid added solution
again evaporated to dryness nitric acid again
added aud again evaporatcd to dryness;
it was at first dissolved in ammonia to try Its
solublity, and that solution evaporated to dry
ness; treated with strong nitric acid and evaporat
ed to dryness twice; some distilled water added
and the solution made up to about one tuld
ounce English Graduates:) now, part of this
solution was taken to be tried in Marsh S ap'
paratus before putting solution in Marsh S ap.
paratus tested the apparatus to sec II
could get spots on porcelain from the burning
let or rings in the tube but could not get
either, indicating purity OF materials; on add
nr the suspected solution made up to one
these are some there handing porcelain
plate to couusel;) the ustre is metallic;
another substance could give spots like this:
dried first over water bath, then in hot air
bath and weighed, and the weight expressed
10 French Zero, point three, lie. five, which is
IS Kilograms. These 35 Kilograms are the
weight Of this sulphuret Of half OF this solu
ton, not including this small sample, there
holding sample up.) Now doubling quantity
for the whole solution, aud converting the
7 French grams into English grains, and calcu.
ating the acid in the sulphuret as arscnlous
acid, the amou0t of arsenous acid from whole
solution would be S6-92 Of an English grain.
The amount Of sulphuret found, not including
quantity retained as sample, represents, loo
of a grain of arsenious acid, the whole con-
tents, which | examined, being liver, spleen,
&c. Now to certify this yellow precipitatc,
to convert into arsenlouS acid, sulphurous
acid was passed through solution; the solution
was then evaporatcd until all the smell OF sui
phurous acid was given off; little distilled wat
er added and sulphureted hydrogen passed
through this clear liquid for about an hour and
a half or two hours; that was allowed to stand
for about six or eight hours and it gave pre-,
cipitate of which this is a part; here handing 10
counsel little via:) it is part OF the preclpl'
tate obtained from the clear liquid with po1sl.
bly, few drops Of distilled water the LIQUID
! from which it was obtained is the same as that
afterwards purified and gone through the same
process; that yellow color under all these condl
tons is one proof of the presence of arsenic it
a pcrsulphurate Of arsenic; the balance of this
yellow precipitate was collected on a filter
paper: washed in distilled water containing
sulphurate of hydrogen as is usual, and
| think treated so third time; solution Of
caustic soda, some powdered carbonate Of soda
and some powdered nitrate of soda were then
added; this solution was eVaporated to dryness
slowly oyer water bath, and when brought to dry
ness the evaporating dish in which it was, vas
placed over Bunsen's burner, the heat gradu
ally raised till all the black and dark matter in
the dish was burned, as soon as the dish cooled
| distilled water was added to residue, heated
gently, and solution filtered; to this solution
strong sulphuric acid was added; the solution
evaporated down till white fumes we're given
of, and the solution obtained without making
any graduate; any arsenic that would have ex-
listed, would have been arsenic acid.
a juror just here was taken sick, and the
Court adjourned for one hour.
At 2 o'clock the Court met and the testl-
moDy of Prof. Tonry resumed Some OF these
spots were collected on another piece OF porce
! lean 10 hypo clorlde OF iron; they we're soluble
in hypo cloride of iron; this would indicate ar:
seDic; the fact of antimony being present would
be thrown out IN part of the process IN former
step, where first solution in ammonia was
made; these spots were obtained from the end
of the burning jet, the tube from which these
spots were made was charged. and the tube was
heated with BuDsen's burner; giving this me-
talic ring in the tube; in same tube in which
| tb;S :. obtained another ohta1ned. that
heated also was reduced in chrystaline form;
showing, under microscope, the chrystaline
form Of arsenious acid; taking the rest of
the gas which passed over. lin Marsh's ap-
paratus, the tube was bent and the solu-
ton passed over again as gas, into nitric
silver this gave preclptate of silver which
was filtered off; the solution was filtered and
evaporated down. the liquid evaporated over a
water bath and slip Of copper foil heated into
solution gave this coating; the rest Of solution
from the sulphuret of arsenic still remained;