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The heats of combustion of graphite and diamond have been redetermined in a high precision aneroid calorimeter. It is shown that the result obtained for graphite is consistent with all recently published figures with the exception of that reported by Prosen & Rossini (1944). The latter is significantly higher than any other. The heat of combustion of diamond is in good agreement with that found by Jessup (1938) when this is recalculated to modern thermodynamic standards. When the present results are combined with published data the best estimates for the two heats of combustion are shown to be:

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