of Water from Salt-Solutions. 513 



other salts at £°=70°. The agreement is, on the whole, satis- 

 factory, and my general conclusions are completely supported. 

 In Table X. I have taken the whole series of Tammann's 

 results, and divided it in two from the temperature point of 

 view, and then taken the mean value in each half. Thus the 

 values obtained are not quantitatively comparable with mine, 

 but are qualitatively so, inasmuch as they show the effect of 



Table X. 



Salt. 



n. 



<°r 



'V 



v i- l ir 



NaOl 



>> 



4-55 



6-75 



10-97 



196 



208 

 220 



192 



203 

 205 



> 



Self. 

 >20 



KC1 



3-33 

 6-45 



180 

 181 



182 

 185 



<? 



= 



" 



NaN0 3 ... 

 ,, 



322 



5-58 

 11-12 

 19-30 



144 

 152 

 152 

 139 



169 

 167 

 158 

 142 



< 



< 



<30 



KN0 3 



>> 



>» 



n 



2-26 



3-15 



731 



15-31 



20-59 



150 



114 



92 



98 

 98 



156 

 119 

 95 

 103 

 109 





<:91 



rise of temperature on the vapour-pressure with solutions of 

 constant strength. Here also there is confirmation of my 

 results, and we arrive at the following conclusions : — 



1. Temperature constant. — The effect of increase of concen- 

 tration is, in the case of NaCl, an increase of the restraining 

 effect of each salt molecule. Such is also the case, though 



less marked, with KC1, while with NaN0 3 and KN0 3 

 precisely the reverse is the case, the four salts forming a 

 series, as is shown diagrammatically above. 



