VARIETIES. 
177 
for fifteen or twenty minutes, and then a part of the decocted leaves are ap 
plied over the organs and kept there until they have become dry by the 
evaporation of the mixture. These operations are then repeated until the flow 
of milk is established, which usually occurs in the course of a few hours. — 
Charleston Med. Journal, Jan. 1851. 
On the removal of Sulphuretted Hydrogen from solutions. By H. Rose. — 
When we have to determine the chlorine in metallic solutions, from which 
the melals are first to be precipitated by sulphuretted hydrogen, the latter 
must be expelled before the precipitation with a solution of silver can be 
undertaken. Heat is not practicable for this purpose, as the chlorine might 
easily be lost by it. In such cases, Rose added sulphate or nitrate of cop- 
per. But here also a loss of chlorine takes place, since the precipitated sul- 
phuret of copper takes up chloride of copper. This can, however, be avoid- 
ed, by adding sulphate of iron to decompose the sulphuretted hydrogen, 
because then the sulphur only is precipitated ; for this, after being wash- 
ed, contains no chlorine. The chlorine is subsequently precipitated by a 
solution of silver. — Pharm. Journ. and Trans. July, 1850, from Poggendorff's 
Annalen, and Pharm, Central Blatt, April, 1850 ; No. 17, p. 271. 
Oxide of Zinc. By M. Sorel. — Some communications having been re- 
ceived at previous sittings of the Academy, containing observations tending 
to cast a doubt on the freedom from injurious consequences resulting from 
the employment of the oxide of zit.c, M. Soiel stated, thai the experience 
of fifteen years has demonstrated to him that the health of the workmen em- 
ployed in working zinc or its oxides, is not at all affected from this cause. 
" During fifteen years, ;? says M. Sorel, 11 we have employed in our galvani- 
zation of iron establishments, several hundreds of workingmen, a great 
number of whom have been for a long time occupied with powdering and 
sifting the grey or suboxide of zinc, with which we make our galvanic paint, 
and never have any of these workmen, who are often in the midst of a 
cloud of oxide, been ill, or complained from this cause. T would also affirm, 
that the white oxide is equally as innocuous as the grey oxide. We have 
manufactured the oxide of zinc on a large scale for several months, and al- 
though the workmen have often respired considerable quantities of oxide, 
they have not suffered the slightest indisposition therefrom. — Ibid. 
Improvement in making Magnets. — Professor Faraday has recently exhibit- 
ed at the Royal Institution, a magnet of great power, made by a new pro- 
cess. A magnet of the same description has also been submitted to the 
Academy of Sciences at Paris. These magnets are made by M. Logeman, 
optician, at Haarlem. The method adopted in their construction has not been 
made public, but it is said to be founded on the researches of M. Elias, of 
Haarlem. The force of these magnets is double that of magnets made in 
the usual way. The one exhibited at Paris weighed one pound avoirdupois, 
and was capable of supporting 27§ lbs. On placing a piece of letter-paper 
