a ee ee eee 
i] 
Miscellaneous Notices by Prof. J.F.Dana. 16 
uy air bubbles escape; but in a few minutes the phials ap: 
pear filled with the euchlorine, which is readily known 
its colour and odour. The gas thus prepared is of course 
impure, but is doubtless as pure as most gases used for 
chemical demonstrations ; it explodes violently by heat and — 
on the contact of phosphorus; itis absorbed by water, to 
which it communicates its peculiar colour. Since I have 
employed this method, only one accident has happened to 
me from this gas, it then exploded spontaneously and threw 
the phial with great force against my forehead, and the mer- 
cury in the vessel over which it was inverted was dashed 
around in all directions. 
Memorandum.—The remarks of Professor Dana, induce 
me to add, that, for several years, I have obtained euchlo- 
rine gas, without accident, by the following process. Chlo- 
rate of potash and muriatic acid diluted with an equal vol- 
ume of water, are placed in a small oom flask, furnished with 
a glass tube, bent twice at right an and passing to the 
bottom of any clean dry phial, ih ap or tube, rather deep 
and with a narrow neck; a spirit lamp, a water bath, or any 
mild heat, applied beneath the flask, soon disengages the 
euchlorine gas, which, by its great weight, displaces the 
common air, from the 4 Sa and occupies its place. By 
using tongs, of a peculiar form, furnished with correspond- 
ing curvatures on their opposite sides, so as to embrace tubes, 
or the necks of vessels securely, the glasses filled with the 
euchlorine gas may be so managed that the operator can 
perform all the experiments, without touching them with 
the hands, by which means the Pr of premature explo- 
sion is avoided.—Editor. Dec. 19,1 
3. Concretion from the Tonsil. 
Mr. Bancroft, a medical student, was afflicted with a severe 
inflammation of the tonsils ; it separated and a small concre- 
tion was discharged psn it. he concretion was of : an ir- 
regular form, and fies 0g less than half a grain. Its col- 
our, light brown ; surface smooth, and through a Jens ap- 
pears composed of smooth rounded grains, exhibiting a 
botryoidal appearance. Before the blow pipe it blackens and 
then becomes white, and is infusible. Soluble in muriatic 
