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The resulting solid was termed a cryohydrate by F. Guthrie, but it is really an intimate mixture of two kinds of crystals, and not a chemical compound or hydrate containing the constituents in chemically equivalent proportions.

The lowest temperature attainable by means of a freezing mixture is the temperature of the F.P. of the corresponding cryohydrate.

The alloy corresponding to the cryohydrate, possessing the lowest melting point, is called the eutectic alloy, as it is most easily cast and worked.

But if we throw into it a crystal of a previous crop of cryohydrate, then nothing but the cryohydrate separates.

This temperature of solidification is the same whether we start with a dilute or a saturated solution, and the composition of the cryohydrate is found to be constant.