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PoUr strong nitric acid on some warm, dry, and finely powdered charcoal. The charcoal will become ignited, giving out an immense quantity of fumes.
Obi. The charcoal absorbs the oxygen from the acid, with such rapidity as to produce ignition.
.Exp. 3. Put half an ounce, or an ounce of oil of turpentine into a small cup ; then pour on it suddenly about half an ounce of strong nitric acid. The

turpentine will burst into flame, with au explosion, sending forth an immense volume of black smoke.
Remark. In making tins experiment, the vessel containing the acid must be tied to a stick, so that the operator may stand at a yard or two distance, from the

explosion.
Obs. The acid inflames the oil on the same principle that it ignites charcoal.
357. Nitric acid dissolves silver, copper, zinc, &c. The solution is more rapid if the acid is diluted with water.
Obs. This acid is called aqua fortis, and under this name is of important use in the arts.
358. When nitric acid is submitted to the action of copper, and some other metals, a part of its oxygen is imparted to the metal, and of consequence the

nitric is converted into the nitrous acid.
359- This acid combines with the alkalies, earth, and metallic oxides, and forms a class of compounds called nitrates. Most of these 3alts deflagrate when

thrown on red hot charcoal.
360. Nitrous acid. When nitrate of potash is exposed to a degree of heat sufficient to deprive it of a part of its oxygen, and the process is then stopped,

and the salt submitted to the action of sulphuric acid and heat, there comes over what is called nitrous acid.
Obs. When nitric acid is charged with the red fumes of nitrous gas, as in the beginning of the process for obtaining this acid, it is more commonly called

nitrous acid. Indeed, chemists have doubted whether there existed an acid properly denominated nitrous, and which bore the same relation to the nitric, that

sulphurous acid does to sulphuric.

 

 

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From whence are the gases obtained ? and by what means ?
In what respect are the gases unlike each other ?
In what respect do they agree ?
Of what do the gases Consist ?
On what do the Weight of the gases depend ?
On what does their Elasticity depend ?
At what rate do the gases Expand by heat ?
What relation is there between the Bulk of a gas and the Pressure which it sustains ?
To what extent can the Bulk of a gas be Reduced by pressure, or Increased by its removal ?
By what substances are the gases absorbed ?
What number ofgases are enumerated ?
How are they classed and divided ?
OXYGEN GAS.
Why has not the base, or ponderable part of oxygen gas been examined in a separate state?
What is the Taste and Smell ofOxygen Gas ?
What is the common method cf procuring thugas ?
From what substances besides Manganese can it be obtained ?
How is it procured from the leaves of plants ?
What are the Peculiar Properties of this gas ?
What phenomena are produced when zinc or iron is heated
in this gas?
What effect does it have on' burning bodies in general ?
What effect is produced on the Weight of a Metal when burned in this gas ?
From whence does it Gain this Accession of weight?
What new Name do the Metals acquire after Combustion in this gas ?
What effect does it have on the colour of blood ?
What new compound isformed when sulphur is burned in the gas? .
What does Nitrogen signify ?
What effect does this gas have on Burning Bodies ?
What are its effects on Animals ?
What Important Compound does it form when mixed with Oxygen gas ? How can nitrogen be obtained.
What is meant by Air ?