and the Formation of Liquid Films. 



101 



1 per cent, of its final value in one or two minutes, but in 

 the dilutest solutions the fall extended over many hours. The 



Fiff. 2. 



4-4- 



(i 

















4-0 





















1 

















| 

















5J 



5 



r T 

















§3-2 







































































2-4- 



— 4^ 



^-CONC 



ENTftAT/ON 



■00225 N 













^ 



INCENTRAT 



on -00824- 



N 



— e— . 



e — 





s 



12 16 



final value, when once obtained, was quite definite (so long- 

 as the surface was not disturbed); but on repeating the time- 

 curves by making a fresh surface in the capillaiy without 

 altering the other conditions, erratic differences of as much 

 as 5 per cent, in the ultimate values obtained were often met 

 with. Before reaching its final value the tension almost 

 invariably passed through a slight minimum, — this is only 

 just perceptible in the curves, but was very obvious in the 

 measurements with the cathetometer. 



The following numbers show the relative values of the 

 surface tension ultimately reached in the different concen- 

 trations obtained in one series of measurements. They 

 represent the differences of the heights of the liquid in the 

 two tubes in cms. multiplied by the densities of the solutions. 



1 



Concentration. 



Relative 



1 

 Surface Tension. 

 ! 



: 



02 normal 





2330 



•06G 





2-300 



•00824 





2275 



•00225 



, 



2-305 



•00206 





2240 



Water. 





615 



