40 Prof. J. N. Bremsted and Prof. G. Hevesy on 



logarithm of the ratio of the remainder and the initial volume. 

 The significance of the rectilinear course as shown in the 

 figure is explained by equation (7) in § 5. 



In order to obtain light mercury, D l has been submitted 

 to a further distillation, and thus separated into a distillate 

 D 2 and a residue 13, R] ; D 2 has been treated in the same 

 way, and so on. The results of the first five experiments of 

 this series appear in Table II. 







Table TI. 







fraction. 



Volume. 



Density. 



Fraction. 



Volume. 



Density. 









D, 



. 642 



0-999977 



DA ... 



... 472 



0-999979 



^ 



. 154 



0999953 



DA ... 



... 101 



0999961 



D 3 



50 



0-999933 



D3R1 ... 



... 35-5 



0-999941 



^4 



13-5 



0-999911 



DA .... 



.. 10 



0-999914 



D 5 



3-3 



0-999881 



As was to be expected, the D-fractions exhibit continuously 

 decreasing densities. From D 5 onwards the systematic 

 treatment described above could no longer be applied 

 favourably on account of the small amount of the material 

 left. It was therefore found profitable to make residues of 

 distillates of high order the material of departure for further 

 distillations, and to unite the various portion of similar 

 density obtained in this way. It was thus possible to in- 

 crease essentially the otherwise quickly decreasing quantities 

 of the higher-order fractions. The results are given in 

 Table III. 



Fraction. 

 D r 



Table 



Volume 

 7-0 

 3-9 

 2-3 

 0-9 

 0-7 

 0-55 

 0-5 

 0-4 

 0-2 



III. 



pensity. 

 0-909874 



D 7 



iy 



0-999824 



D 9 



D10 



D11 



D 1Q 



0-999779 



D iq 





D lt 



0-99974 



The densities are seen to be steadily decreasing. The 

 lightest mercury possesses a density deviating from that of 

 the ordinary mercury by about J °/o — tne same deviation as 

 shown by the heaviest mercury in opposite direction. The 

 density difference between the heaviest and lightest mercury 

 therefore amounts to nearly •§- °/ 00 . 



