Properties of Liquid Mixtures. 



291 



by fig. 2, in which the isothermals of 90° and 75° are suffi- 

 ciently represented. That of 90° is comparable with the curve 









I 



ig. 



2_ 



-Isotherm 



als 



of Phenol- Water Mixtures. 









































































































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100 

 mm. 



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Per cent, phenol in water. 



for alcohol-toluene mixtures (see fig. 2 in the preceding 

 memoir), only that the flatness extending over a great part of 

 the range of concentrations is exaggerated in the phenol- water 

 mixtures. The curve for 75° — still above the critical point — 

 is still flatter; indeed it is imposible to say whether it rises or 

 falls. Probably, therefore, below the critical point (where 

 the vapour-pressure of phenol is inconveniently small for 

 measurement) the isothermal, instead of consisting of a hori- 

 zontal line bounded by two curves, would consist of a hori- 

 zontal passing through the point representing pure water, 

 bounded at the other end only by a descending curve. Such 



