14 



Mr. W. Sutherland on the Fundamental 



This table shows that for the first 7 compounds the values 

 of M 2 Z by (13) are about 1*2 times those by (7), while for the 

 last 3 they are only about *6 times ; the values for the surface- 

 tension of the last three are not so trustworthy as those of the 

 first seven, in most of which Quincke's and Traube's values 

 agree. The above table could be extended by a number of 

 data of Traube's relating to compounds of Na and K with 

 compound acid radicals ; but the above table is representative, 

 showing the average agreement of the two methods and the 

 three worst cases of disagreement. It is to be remembered 

 that the experimental determination of a. m is difficult, and that 

 the theories of the equations (7) and (13) are both only 

 approximate ; and hence, all things considered, the above 

 comparison ought to satisfy us that our equations can yield 

 at least approximate relative values of M 2 Z for inorganic com- 

 pounds. In the next table are collected the data required in 

 (13) for the haloid compounds of the metals and a few non- 

 metals, along with the values of M 2 Z and of Mlp/J or L, the 

 latent heat of vaporization due to molecular force for a 

 gramme-molecule. Some of the data in Table II. are slightly 

 different from the corresponding ones in Table III. 









Table III. 













Li. 











Na. 







F. 



Cl. 



Br. 



I. 



F. 



Cl. 



Br. 



I. 



T 



1070 



870 



820 



719 



1270 



1045 



981 



901 



M/p 



11-3 



21-3 



28-0 



38-4 



16-4 



27-3 



33-4 



43-5 



M?l 



120 



20-0 



28-0 



36-2 



21-2 



32-5 



41-1 



52-4 





25-3 



22-4 

 K. 



23-8 



22-5 



30-8 



28-4 



29-3 



Rb. 



28-7 





F. 



01. 



Br. 



1. 





Cl. 



Br. 



I. 





1060 



1007 



972 



907 





983 



956 



915 



M/p 



28-2 



38-3 



44-6 



54-3 



... 



54-8 



59-5 



70-3 



M.H 



32-7 



460 



55-7 



667 





69-2 



76-9 



90-8 





276 



286 



Cs. 



298 



29-2 





301 



308 

 Be. 



30'8 







Cl. 



Br. 



I. 





Clo. 



Br a . 



I a . 



T 





904 



879 



869 





870 



870 



770 



M/p 





76-2 



809 



917 



... 



39 



... 51 



66 



/ r 



M.H 





93-8 



1007 



116-4 



... 



40-9 



60-.8 



73-8 







29-3 



296 



30 3 



... 



250 



28-4 



26-7 



