PROOFS OF THE PROPERTIES OF OXIGEN GAS.

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Rationale. ..This experiment is analogous to the former;the zinc unites to the oxigen of the gas, at an elevated tempera-ture, and the result is an oxid of zinc.

Experiment III.

Combustion of arsenic in oxigen gas.

Take a piece of metallic arsenic, dip it into oil of turpentine,and place it in a copper ladle, then set fire to the oil which ad-heres to it by means of a candle, and introduce the ladle intoa receiver filled with oxigen gas ; the metal will take fireand burn with a thick flame, and the whole receiver will befilled with white vapours.

Rationale. ..In this experiment arsenic acid is formed by theoxigen combining with the metal.

Experiment IV.

If a current of oxigen gas be conveyed to filings of metals,they will burn with great rapidity.

For this purpose fill a large bladder with oxigen gas, and adaptto it a tube; by pressing the bladder and ejecting the gas on apiece of excavated ignited charcoal, into which filings of metalhave been put, the metal will burn rapidly*.

The filings of metals which exhibit the most brilliant appear-ance are those of zinc, copper, antimony, iron, and steel.

DECOMPOSITION OF OXIGEN GAS BY VARIOUSOTHER SUBSTANCES.

Experiment I.

If a lighted wax taper fixed to an iron wire be let down intoa vessel filled with oxigen gas, it will burn with great splendor.

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