453 



pressure as clearly as possible 1 liavo not considered the sokibililj 

 as function of the temperature, l)ut led by the theoretical expression 

 for the solubility curve in its simplest shape : 



a 



I have calculated the values of /c^ .;; and - (eiohth and ninth columns 



of table 2), and drawn them as ordinate and abscissa in the graphical 

 representation (iig. I). The temperature range being small here I 



l<^ig. 1. 



expected the above expression to account satisfactorily for the ol)ser- 

 vations ; the observations below and those above the transition point 

 will present a straight line in this case. It appears from the graphi- 

 cal representation that really two straight lines can be drawn through 

 the observed points so that the deviations occur irregularly on cither 

 side of these lines; at the same time in the tracing of these lines 

 the probably smaller accni-acy of the tirst determinations has been 

 taken into account. I have calculated the values of n and b for 

 both lines from the graphical representation; the equations of the 

 lines drawn are : 



