132 Prof. A. J. Brown and Mr. F. Tinker. Absorption of 



was very simply done by cutting the capillary tube at that point, 

 formula employed was 



_ qhrd 



The 



where g = 981 cm. /sec. 2 , h = capillary rise in cm., r = capillary radius 

 in cm., d = density of solution, s = surface tension of the solution in 

 dynes/ cm. 



lor the sake of brevity the results only are given. They are correct to 

 the nearest one or two units only, since the error in the determination of 

 the capillary rise and the capillary radius might have amounted to 1 per cent, 

 in each case. But a greater accuracy than this was not necessary for the 

 present purpose. 



Table VIII. — Showing Surface Tensions of the Phenolic Solutions. 



Surface tension. 



Temp. 19° 0. 



Temp. 32-2° C. 



Surface tension at 

 26-6° C. 



Water 



N/2 phenol.... 

 N/2 catechol . 

 N/2 resorcinol 

 N/2 quiuol 

 N/2 pyrogallol 



dynes/cm. 

 71 -8 

 43 -3 

 56 "3 

 63 -8 

 63 -7 

 69 -8 



70 6 



N/2 phenol 



43 -8 



41 -7 



N/4 „ 



49 -5 



56 3 



N/8 „ 



55 -2 



60-0 



N/16 „ 



64 -8 



59 -3 



N/32 „ 



69 -6 



69 -2 





71 -5 



If the surface tensions in the above Table are compared with the corre- 

 sponding absorption constants given in Table VI it will be seen that there 

 is a remarkable relationship between the two. The order in magnitude of 

 the absorption constants is the same as the inverse order of the surface 

 tensions in the case of all three series. When the surface tension is 

 abnormally low the absorption constant is abnormally high. Seminormal 

 phenol solution, for example, has a surface tension about half that of water, 

 and an absorption constant about twice as large. Indeed, the absorption 

 constant is approximately inversely proportional to the surface tension of 

 the solution, and this holds whatever the temperature may be. The product 

 of the surface tension and the absorption constant is therefore practically 

 constant. This is shown for the seminormal phenolic solutions at 19° C. in 

 Table IX. 



