378 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



The following table gives the results of experiments with these 

 substances. 



Tis the temperature, P the pressure in atmospheres, H the height of 

 the meniscus in cm. (corrected for concavity inside and outside the 

 capillary*), a> the contact angle, d — d' the difference between the 

 densities of olive oil and alcohol vapor, and a the surface tension in 

 dynes per cm. 



Above 232° the meniscus flattened and absorption took place so rapidly 

 that observation was impossible. 



Liquid Alcohol and Olive Oil. 



An experiment over any considerable range in temperature was im- 

 possible with the capillary used, as above 40° the meniscus sunk so low 

 as to be invisible. 



At 30.2° the value of a was 14.2 dynes per cm.,f « being at this 

 temperature although it did not remain so at higher temperatures. 

 r u r 2 , and r s were .348 cm., .102 cm., and .068 cm. respectively. 



* Tliis correction was marie by adding J ?j and subtracting .11 (r 3 — r„). 

 t Tiiis is the result of a single experiment. 



