Correction to a paper on "The Origin of the Small Bubbles of 

 Froth," added March 25th, 1912. 



In considering, from an elementary point of view, the question 

 of the surface excess of concentration in a paper on " The Origin 

 of the Small Bubbles of Froth," this volume, part n, the change 

 in the kinetic energy of the molecules in the surface layer, which 

 accompanies, under adiabatic conditions, any alteration of the 

 potential energy, was neglected. When this change is taken into 

 account the second term on the right hand side of the expression 

 for the surface excess of concentration on pages 213 and 224 dis- 

 appears and the formula becomes the same as that previously given 

 by the other writers mentioned. I am indebted to Professor 

 Donnan, m.a., f.r.s., for kindly pointing out the mistake, which 

 involves indeed a misquotation of Willard Gibbs' result. — J.A.P. 



[Instruction to binder — To face page 212.] 



