been shown." On the question, "does the essential force 

 depend on the entire aggregation of the substance with which 

 it is characterized, i.e. on all the substance, or does it 

 depend mainly on one constitutive part, or on individual 

 substance which can be considered as the constituent part of 

 the living animal and plant substance, but separated from 

 it?" Wolff answered that "for me the latter, for many reasons 

 appears much more evident." (§ 178, p. 94) Remarking that 

 in regard to the essential force of the animal substance 

 there were yet many things which were not clear, Wolff ended 

 his work with the following words: "Concerning the essential 

 force of the plant substance, I do not believe that I have 

 made a mistake on any important point." 



113 



