| | those of iodide, but no reliance
| | can be placed on this.
| |
Silver nitrate | Potassium nitrate, | Will not yield the full quantity
| sometimes present | of chloride on precipitation
| in the fused | with HCl. Gives a purple color to
| sticks--not in | flame.
| the crystals |
| |
Sulphuric acid | When vended as pure,| No easy test can be given, as the
| it invariably | substances are so numerous some of
| contains a trace of | them volatile, and most require
| iron. Common acid is| separation from the acid before
| also liable to | detection.
| contain arsenic, |
| selenium, thalium, |
| and many other |
| substances. |
| |
| Organic matter, as | Gives a brown color to the acid.
| a piece of straw |
| in a carboy of acid |
| |
Hydrochloric acid | Arsenic | Marsh’s test.
| |
| Some yellow samples | Reinsh’s test; a small piece of
| contain no iron, | copper foil becomes coated
| but an organic salt,| on boiling in dilute acid.
| and give an alkaline|
| ash on ignition of |
| the residue after |
| evaporation |
| |
Calcium chloride | Calcium hydrate | The clear filtered solution made
| | with distilled water is alkaline
| | to test paper, and gives a
| | precipitate on breathing into it
| | through a tube.
| |
Pure (?) chemicals| Broken glass, bits | These impurities either float or
generally | of straw, wood, | sink on solution, and may easily
| paper,
etc. | be seen.
------------------------------------------------------------
-------------
G.M. JONES, M.P.S.
* * * *
*
THE CATASTROPHE AT CHANCELADE.
The Chancelade quarries near Perigneux, which caved
in Oct. 22, 1885, under circumstances that are still
fresh in the minds of all, have gained a celebrity
that renders it unnecessary for us to revert to the
details of the catastrophe. It will suffice to
recall the fact that after the accident a private
committee was formed for the purpose of making an
attempt to save the five victims who had been surprised
in the drifts, and who happened to be in the bottom
levels.
[Illustration: FIG. 1.—PHOTOGRAPHIC
EXPLORING APPARATUS.]
The Lippmann establishment at once offered to make
a boring by means of which it would be possible to
communicate with the galleries in which the men were
imprisoned, but, despite the most active efforts,
success was found impossible. In order to satisfy
public opinion, the committee resolved to bore a well
12 inches in diameter to a depth of 23 feet, that
should permit of reaching the gallery; but this did
not render the latter accessible. How was it
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