( 103 ) 



In both compounds the />,^hnes have also been determined with 

 excess of chloral or aniline. A very small quantity of these suffices 

 to cause the occurrence of liquid in presence of the compound at 

 temperatures far below the melting point and we then move on the 

 lowest branch of the three-phaseline. 



In the case of a slight excess of chloral (Fig. 1) this was followed 

 from D over J\ to F^ just a little below the melting point, and from 

 there one passed on to the liquid-vapour line F^A^, which was 

 situated a little above FA. 



In the case of a slight excess of aniline the piece DT^TfiF^ 

 could be similarly followed (Fig. 2). In this occurred the minimum T^, 

 whilst the piece GF^ coincided entirely with the corresponding part 

 of GF, which had alreadj' been determined in the experiment with 

 the pure compound. Just below F the compound had disappeared 

 entirely and one passed on to the liquid-vapour line F^A^, which, 

 unlike that in Fig. 1, was situated below FA. 



If the excess of the component is verj' trifling, liquid is formed 

 only at higher temperatures of the three-phaseline, and below this 

 temperature a sublimationline is determined, with excess of the 

 component in the vapour, which line must, therefore, be situated 

 higher than the pure sublimationline. 



With chloralalcoholate a similar line BE (Fig 1) was determined, 

 situated decidedly above LF. At E, liquid occurred and a portion of 

 the three-phaseline EF was followed up to a point situated so 

 closely to F that the liquid-vapourline, which was then followed, was 

 situated scarcely above FA. 



The excess of chloral was, therefore, exceedingly small, but in 

 spite of this, BE was situated distinctly above EF. The position of 

 BE depends, in a large measure, on the gas-volume above the solid 

 compound, as this determines the extra pressure of the excess of 

 the component, which is totally contained in the same ; so long as 

 no liquid occurs. It appeared, in fact, to be an extremely difficult 

 matter to prepare chloralalcoholate in sucii a state of jnirity that 

 it exhibited the lowest imaginable sublimationline LF, which meets 

 tiie three-phaseline in F. 



Similar sublimation lines may also occur with mixtures containing 

 excess- of alcohol. But also in this case, even with a very small 

 excess of alcohol we shall retain liquid even at low temperatures 

 and, therefore, obtain branch CTF of the three-phaseline. Such hap- 

 pens, for instance, always when we use crystals of tiic compound 

 which have been crystallised from excess of alcohol. They then 

 contain sufficient mother-liquor. 



