and Surface Energy. 

 Table II. 



au 



Substance. 



<7X10 S 

 cms. 





BT (cals.) 

 Vp (ergs) 



(found). 



Vp 



(calc). 



Ether 



CS a 



Ethyl formate 



Ethyl acetate 



Ethyl iodide , 



Methyl isobutyrate 



CC1 4 



CHCl a 



Benzene 



Toluene 



Aniline 



Oxygen 



Nitrogen 



441 



4-18 

 4-09 

 4-31 

 4-20 

 503 

 4-52 

 4-34 

 4-88 

 4-84 

 4-70 

 3-21 

 3-50 



3*26 

 3-43 

 351 

 3-33 

 3-42 

 2-85 

 318 

 331 

 2-94 

 297 

 3-05 

 4-47 

 4-10 



•36 

 •38 

 •30 

 •38 

 •36 

 •35 

 •33 

 •36 

 •35 

 •33 

 •33 

 •47 

 •50 



3-62 

 3-82 

 335 

 3-98 

 3-83 

 3-68 

 3-43 

 3-78 

 3-75 

 333 

 3-31 

 501 

 443 



362 

 3-81 

 3-81 

 3-71 

 3-78 

 3-20 

 351 

 3-67 

 329 

 330 

 3-38 

 494 

 4-60 



It will be noticed that the expression 



The data used are from the same sources as in Table I. 

 Excluding oxygen and nitrogen, the mean of each column 



for r=— is 3*6. The agreement between the "observed" and 

 V p 



calculated results for oxygen and nitrogen is particularly 

 interesting. • 



Kl (cals.) . 



Vp (ergsj 



approximately a constant for the organic liquids. Its 

 significance will be discussed in a later communication. 



When surface energy is expressed as " specific cohesion," 

 defined by 



a 2 = £ot milligrammes weight per mm. 



(s = sp. gr.) 5 we get, putting the author's equation in the form 



i El — ^i 



J ' d " 6 



^ = specific volume, 



\ t - = internal latent heat per gramme), 



\i . d . J 



r hence 



P = 



,2_ 



6v ' 

 2\i .d.J 



h - 3x9 ' 8 1 



a 2 ~ d . J * 



