ISO PROCEEDINGS OP THE AMERICAN ACADEMY. 



4. Moreover, since the equation represents this fundamental theorem, 

 its logarithmic quantity must represent tin- variables in the reacting 

 tendency, or the driving energy of reaction. 



5. When analyzed, this equation shows that the part played by each 

 substance in a reaction may be considered :i> the logarithm of the product 

 of its "physico-chemical potential " and its actually present pressure. 



G. The reaction metathenn may be simplified into B reaction-isobar 

 and a reaction-isochor, according B8 the pressure or volume is kept 

 constant during the reaction. 



7. While the reaction-isobar, expressed in terms of pressure, offers the 

 most convenient basis for the calculation of the cases to which it is 

 applicable, results obtained under constant volume are more conveniently 

 calculated if the reacting substances are expressed in terms of concentra- 

 tion, according to the equation of vau't Hoff. 



IIakvakd University, April u, l'JOO. 



