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Updated: May 13, 2025
This leads to the assumption that meat is protected from change by acids, even by gases of that kind; and in fact it was noticed that beef from 2 to 5 kilos. being taken when placed in an earthen vessel and loosely covered with a wooden cover, was long preserved from putridity if the bottom of the vessel contained some hydrochloric acid, nitric acid, or aqueous sulphurous acid.
Concentrate the solution of meconic acid, allow a portion to crystallize, and apply tests. Tests. Morphine and its acetate give an orange-red colour with nitric acid, becoming brighter on standing; decompose iodic acid, setting free iodine; with perchloride of iron, gives a rich indigo-blue; with bichromate of potassium, a green turning to brown.
I can inoculate with various liquids acids, weak nitric acid, alkalis, ammonia, neutral bodies, spirits of wine, essence of turpentine and obtain conditions similar to those of the victims of the predatory insects, that is to say, inertia with the persistence of a dull vitality betrayed by the movements of the mouth-parts and antennae.
In the experimental sciences, they originated chemistry; they discovered some of its most important reagents sulphuric acid, nitric acid, alcohol. They applied that science in the practice of medicine, being the first to publish pharmacopoeias or dispensatories, and to include in them mineral preparations.
The acid will dissolve magnesium pyrophosphate from the surface of the particles of carbon, which will then burn away. Nitric acid also aids as an oxidizing agent in supplying oxygen for the combustion of the carbon. The magnesium ammonium phosphate is readily dissolved by acids, even those which are no stronger than acetic acid.
For the detection of minute quantities, the microscope must be used, and Guy's and Helwig's method of sublimation will be found advantageous. Crystalline poisons may be recognized by their characteristic forms. These are sulphuric, nitric, and hydrochloric acids. Symptoms of Poisoning by the Mineral Acids.
So, too, when we heat vegetable humus to 100°, nitrification is arrested, because the ferment is killed. Finally, we may sow the nitric ferment in calcined earth and cause nitrification to occur therein as surely as we can bring about a fermentation in wine by sowing Mycoderma aceti in it.
These substances were formerly thought to be nitro-substitution compounds, but are now known to belong to the compound ethers of nitric acid. Gun-cotton, discovered by Schonbein, in 1845, has since been looked upon as the most promising material for a smokeless gunpowder, it being a very powerful explosive and burning with practically no smoke.
Concentrated acid gives off irritating orange-coloured fumes of nitric acid gas. When poured on copper, it gives off red fumes and leaves a green solution of nitrate of copper. It gives a red colour with brucine, turns the green sulphate of iron black, and with hydrochloric acid dissolves gold.
I never saw a finer bit of unutterable indignation than came over the face of my hostess, as she slowly recognized him. She drew herself up, and dropped out the monosyllables of her answer as if they were so many drops of nitric acid. "Ah," quoth my lady, "we called him Bob!" It was a group for a painter.
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