292 HYDROGEN ION CONCENTRATION 



interpretation of bioelectric currents, ionic permeability, stimulation, 

 and other equally important biological processes upon the activity of 

 forces at interfaces between an aqueous and a non-aqueous phase 

 (page 191) or upon the capillary electric phenomena in narrow-pored 

 gelatinous diaphragms. 



The limits of the designated subject of this book were somewhat 

 exceeded in the last chapters, though it was not attempted to present 

 a complete description of the bordering problems. However, it is 

 just in this impossibility of sharp delimitation of the subject and in its 

 constantly growing sphere of influence in other fields that its funda- 

 mental importance is manifested. Nor does the future seem far dis- 

 tant when the small portion of physical chemistry, here presented, 

 doubtlessly improved and changed in many respects, will become the 

 ultimate basis of that rational physiology which we expect to see 

 developed in the next few decades. 



