496 
Notices . 
and phosphorus. With ammonia it forms a detonating compound. 
When it comes in contact with oxymuriatof sulphur it assumes a 
violet colour tff great intensity and beauty. It may be made thus 
in a small way. Take the crystaliizable residuum of a solution of 
Kelp, or of Spanish Barilla, after all the saline matter capable of 
crystallization is separated. Put a dram of this previously fused 
for a few minutes to free it from moisture, and reduced to a coarse 
powder, into a thin glass tube 10 or 12 inches long and thr e- 
eighths of an inch in the bore : add to it without soiling the inside 
of the tube, about half its weight of oil of vitriol : this may be 
done by sucking the acid up with the mouth in a small long glass 
tube drawn out to a capillary point, applying the linger to the up* 
per orifice, and thus by means of it, transferring the acid into the 
larger tube. Shake the whole together and apply a gentle heat 
by a lamp or taper. A dense vapour will make its appearance, 
and a black glistening powder (lode) will be sublimed in the 
colder part of the tube. Cut off by means of a file, the part of 
the tube which contains the lode, and seal the extremities of it 
by means of a blow-pipe or a spirit lamp. 
The preparation of lode on a larger scale. Place a long, slen* 
der necked, tubulated retort in a sand bath : surround the whole 
body of the retort up to the tubulure with sand, and adapt without 
luting to the beak of it, a wide mouthed vial or receiver. Intro* 
duce through the tubulure, first one part of oil of vitriol, and then 
two parts of the fused saline mass before mentioned, broken into* 
small pieces of the size of pease, and distil for a few minutes with 
a gentle heat. The lode will become sublimed into the neck of 
the retort in a crystalline form, exhibiting a black shining crust. 
Cut off the neck of the retort with a file, and collect the lode by 
means of a feather or camel’s-hair brush. 
If the whole of the saline mass of kelp or barilla, freed from 
carbonat of soda only, and which of course contains muriat of soda, 
muriat of potass, sulphat of potass, hydrosulphuret of potass, &c. 
be treated with sulphuric acid, the preparation of the lode, be- 
comes more difficult. 
Mr. Mannoury Dectot has invented a new hydraulic machine, 
a report concerning which has been presented to the French In- 
stitute. The principle of this machine is to communicate the 
whole of the momentum of a body of water entering a vessel, after 
falling from a height, to a solid body within that vessel, except 
