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minimum occurs in the pressure of the liquid mixtures of its 

 components. 



Mr. Leopold has now succeeded in giving experimental contributions 

 in regard to both questions, bj means of a series of \'ery accurately 

 conducted researches where chloralalcoholate and anilinehjdrochloride 

 occur as solid compounds. 



Solid compounds which jield two perceptibly volatile components 

 (such as PCI3, NH,.H,S, PH3.HCI, C0,.2 NH, etc.) have been investi- 

 gated previously, hut either merely as to their condition of dissociation 

 in the gaseous form, or as to the equilibrium of solid in presence 

 of gaseous mixtures of different concentration at constant temperature; 

 but liquids occur only at higher pressures, so that the course of 

 the three-phase lines had never been studied. 



These two compounds were selected because in their melting points 

 neither temperature nor pressure were too high. Moreover, the diffe- 

 rence in volatility of the two components in the first example (chloral 

 -f- alcohol) was much smaller than in the second (aniline -f- hydrogen 

 chloride). It was also safe to conclude from the data of both com- 

 pounds that the liquid mixtures of their components would show a 

 minimum pressure. 



