[63] Thus, for instance, a mixture of 56 parts of CaO and 24 parts of

magnesium powder is heated in an iron pipe (placed over a row of

gas burners as in the combustion furnace used for organic

analysis) in a stream of hydrogen. After being heated for 1/2 hour

the mixture is found to absorb hydrogen (it no longer passes over

the mixture, but is retained by it). The product, which is light

grey, and slightly coherent, disengages a mass of hydrogen when

water is poured over it, and burns when heated in air. The

resultant mass contains 33 per cent. CaH, about 28 per cent. CaO,

and about 38 per cent. MgO. Neither CaH nor any other MH has yet

been obtained in a pure state.

The acetylene derivatives of the metals of the alkaline earths

C_{2}M (Chapter VIII., Note 12 bis), for instance, C_{2}Ba,

obtained by Maquenne and Moissan, belong to the same class of

analogous compounds. It must here be remarked that the oxides MO

of the metals of the alkaline earths, although not reducible by

carbon at a furnace heat, yet under the action of the heat

attained in electrical furnaces, not only give up their oxygen to

carbon (probably partly owing to the action of the current), but

also combine with carbon. The resultant compounds, C_{2}M, evolve

acetylene, C_{2}H_{2}, with HCl, just as N_{2}M_{3} give ammonia.

We may remark moreover that the series of compounds of the metals

of the alkaline earths with hydrogen, nitrogen and carbon is a

discovery of recent years, and that probably further research will

give rise to similar unexpected compounds, and by extending our

knowledge of their reactions prove to be of great interest.

Thus the analogies and correlation of the metals of these two groups

are now clearly marked, not only in their behaviour towards oxygen,

chlorine, acids, &c., but also in their capability of combining with

nitrogen and hydrogen.

* * * * *

END OF THE FIRST VOLUME

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* * * * *

Transcriber's note:

The half-title has been deleted.

Obvious misprints were corrected.

Inconsistant hyphenation was kept as it is.

The Principles of Chemistry, Volume I · 第 21 / 21 章