izal.ion, oeellrring wil bout any intimat� change ill th(� ehemieal eous1.iLn! ion of the llod y . TllOllgh r('vreseut· ing tbe same elwmieal element, (;ariJon asslimes ill tile solid state a multitude of differ-eut eOlllli!iolls, ex· hibiting rather different physical and ellemical prop· erties. There seems to be a series of progressive eon· densations, the limits of whieh woult! eorresllond with the different modifications of carbon. According to ordinary analogies, the physical prop· erties

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... f composits bodies, capahle of being formed directly, are a consequence of those of their com· ponents, except that they are more or less modified on account of Lhe loss in energy resulting by reason of this combination. The combination of hydrogen, boil ing at -252 deg., and that of oxygen, boiling at -182 cteg. C., will thus give water, which boils at +100 deg. C. The energy which maintains at the gaseous state the free molecules of hydrogen and oxygen, has thus decreased to an enormous extent, as corresponding with the 59,000 calories lost at the instant of their combination, with the formation of a molecule of