Evaporate the filtrate to half its
bulk, digest with alcohol, and evaporate alcohol off in a water-bath.
Dissolve residue (sulphate of nicotine) in water, and make solution
alkaline with potash; then shake with ether in a test-tube. Remove ether
and allow it slowly to evaporate. Test resulting alkaloid.
_Tests._--No change of colour with the mineral acids. White deposit with
corrosive sublimate. Sulphuric acid and bichromate of potassium give a
green colour, oxide of chromium. Precipitate with bichloride of platinum
and with carbazotic acid.
=Lobelia Inflata= (Indian Tobacco).--Much used in America by the
Coffenite practitioners, and a valuable remedy for asthma.
_Symptoms._--Nausea, vomiting, giddiness, cold sweats, prostration.
Headache, giddiness, tremors, insensibility, and convulsions.
XLI.--HYDROCYANIC ACID
=Prussic Acid= is the most active of poisons. The diluted hydrocyanic
acid of the Pharmacopoeia contains 2 per cent. of hydrocyanic acid,
Scheele's 4 per cent. It is a colourless liquid, feebly acid, with
odour of bitter almonds.
=Cyanide of Potassium= is largely used in photography and in
electro-plating, and is also poisonous.
Pages:
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227