MISCELLANY. 
237 
other microscopic objects, published by Dr. Donne, of Paris, which 
had been procured in this way. — Ibid., Meeting of the British Assoc. 
Saponine and Ganteine for cleaning Kid Gloves. — M. Duvignau has 
taken out a patent for a preparation intended for cleaning gloves, and 
called saponine, which, according to the patent is made as follows : — 
Take of Soap in Powder 250 parts. 
Chloruret of Potash (Eau de javelle) 165 " 
Solution of Ammonia 10 " 
Water 155 " 
Make the whole into a paste, a small portion of which is to be rub- 
bed over the glove with a small piece of flannel, until it is sufficiently 
cleaned. 
M. Buhan has prepared and sold a compound which he calls gan- 
teine, which consists of soap and essence of citron, made into a paste 
with water. — Pharm. Jour. 
On the Action of Nitric Acid upon Brucine. By A. Laurent. — It had 
been stated by Gerhardt, that nitrous aether was formed in the action of 
nitric acid upon brucine, when this, as is well known, is coloured red, 
an assertion which Liebig declared to be unfounded. Laurent, who 
repeated Gerhardt's experiment, arrived at the same Tesult, but ob- 
tained moreover a new substance, which he calls cacotheline 7 the com- 
position of which is represented by the formula C 10 H 22 N 4 10 . This 
substance yields, on treatment with ammonia, various products, one 
of which is a powerful base. — Chem. Gaz.from Comp. Ren. 
Preparation of Aurocyanide of Potassium for Electro- Gilding. By 
Alex. Kemp. — Dissolve 1 part of gold in nitrohydrochloric acid, and 
render the solution as neutral as possible by evaporation to dryness ; 
redissolve the chloride of gold in 8 parts of water, and heat the solu- 
tion until it boils; add as much calcined magnesia as is equal to half 
the weight of the gold, and boil the whole till the liquid loses its yel- 
low colour ; the precipitate which forms is oxide of gold, with the ex- 
cess of magnesia. Throw it on a filter, and wash it with boiling water 
until the liquid passes through tasteless. Having dissolved 8 parts of 
Liebig's cyanide of potassium in 80 of boiling water, pour it on the 
filter while still hot, it will dissolve the oxide of gold, leaving the 
magnesia unchanged. The same method maybe followed in forming 
the silver solution, substituting nitric acid for the mixture of nitric and 
hydrochloric acids used in forming the gold solution. — Ibid. 
On Thialdine and Selenaldine, two new artificial organic bases. By 
MM. Wohler and Liebig. — On passing hydrosulphuric acid into an 
