proves its practical efficiency, and therefore the question of its
advantage, as compared with washing and scrubbing, is based chiefly
upon financial considerations. It is evident that in foreign parts,
or in any place where there is a difficulty in disposing of the
ammonia, the obtaining of the same in a dry form offers several
advantages as compared with having it as a weak solution.

* * * * *




RECONVERSION OF NITRO-GLYCERIN INTO GLYCERIN.

By C.L. BLOXAM.


The following experiments on this subject appear to possess some
interest at the present moment:

1. Nitro-glycerin was shaken with methylated alcohol, which dissolves
it readily, and the solution was mixed with an alcoholic solution of
KHS (prepared by dissolving KHO in methylated spirit, and saturating
with H_{2}S gas). Considerable rise of temperature took place, the
liquid became red, a large quantity of sulphur separated, and the
nitro-glycerin was entirely decomposed.

2. Nitro-glycerin was shaken with a strong aqueous solution of
commercial K_{2}S. The same changes were observed as in 1, but the
rise of temperature was not so great, and the liquid became opaque