CLARK. — SURFACE TENSION BETWEEN LIQUIDS AND VAPORS. 375 

 The following figures show the results for glycerine and olive oil : 



Curves shown in Figure 11 were plotted and the densities used in cal- 

 culation taken from these. 



20 40° 60° S0° 100° 120° H0° 160° 180" 200° 220° 240° 



Figure 11. 



The values of vapor densities of lighter liquids were taken from results 

 obtained by other observers, and the curves of Figure 12 plotted. These 

 particular figures are from Ramsay and Young.* 



The diameters of the capillary tubes were determined by breaking and 

 measuring with microscope. 



Thus far the liquids observed divide themselves into two groups : 

 1st, those in which the vapor of the vaporized liquid condenses on the 

 other liquid at a temperature higher than the temperature of the saturated 

 vapor, and 2d, those in which this condensation temperature is lower 

 than the saturation temperature. Cantor f has shown that whether or 



* Kamsay and Young, Phil. Trans., 178, 57 (1887). 

 t Cantor, Wied. Ann., 56, 493 (1895). 



