Wolff's article is called "About the inherent essential 

 power of the plant as well as of the animal substance. "5 its 

 introduction compared Blumenbach' s and Born's opinions. It is 

 written in quite a friendly tone and is concerned more with 

 Blumenbach's theses, because Born's article was less original 

 and to a certain extent full of citations from the previous 

 work of Wolff and Blumenbach. 



Wolff remarked that according to Blumenbach, the power 

 or force which moves the nutritional juices is related, 

 primarily, to the selective properties of the feeding tissues 

 and, secondly, to the delivering force of the vessels or 

 generally to the cavities containing those juices. On the 

 contrary, Born found in the nutritional juices themselves 

 the basis of the movement of the juices during feeding, growth, 

 regeneration of the lost parts and healing of wounds. In other 

 words the juices themselves acquire, in his opinion, the 

 property of moving in definite directions. Without disproving 

 any of the authors' opinions, he came to his understanding of 

 the question. 



First Wolff developed the idea ($1-5) that the 

 nourishing power could not be related only to the hard or 

 solid nourished parts of the body or only to the nourishing 

 juice itself, but in his opinion, "it is inherent in the solid 

 or hard, as well as in the fluid parts." ($ 4, p. 5) Turning 

 to the character of the powers inherent in the living body 

 ($ 6 - 8), Wolff stated his belief that these powers or 

 forces are as such: reciprocal attraction of the homologous 

 parts and repulsion of the heterologous parts in the nourish- 

 ing juices, and also attraction between homologous solid and 

 fluid parts and reciprocal repulsion of the heterologous 

 parts ($ 7; p. 7). Consequent to that, there is an important 

 observation that "defining and distinguishing the forces from 

 each other cannot be done other than by their actions." ($ 8, 

 P. 7) 



Next comes a detailed justification of the existence of 

 attractive C$ 9 - 16) and repulsive C$ 17 - 29) forces in the 



5. "Von der eigenthumlichen und wesentlichen Kraft der 

 vegetabi lis chen sowol als auch animalischen Substanz" 

 (pp. 3 - 94) . 



107 



