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As an example of this, it is well known that salt water freezes at a lower temperature than fresh water, and hence sea-water may be quite liquid while rivers and ponds are covered with ice. Again, it is noticed that mixtures of salts often have a fusing-point lower than that of either of the constituent salts, and of this fact we often take advantage in fluxing operations.
This increase in the proportion of stearoptene is also shown by the progressively heightened fusing-point of rose oils from different sources: thus, while Bulgarian oil fuses at about 61 deg. to 64 deg. Fahr., an Indian sample required 68 deg. Fahr.; one from the South of France, 70 deg. to 73 deg. Fahr.; one from Paris, 84 deg.
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