PHYSIOLOGY. 447 



blood, which now streams into the capillary vessels of 

 the fibre, and renders the two ends of the latter hetero- 

 geneous. 



2 7 12. Thus, if the nerve be cut across, it remains 

 always indifferent, and no motion can any longer ensue. 

 But this does ensue so soon as the nerve is galvanized. 

 A proof that the nervous influence is homologous to the 

 galvanic tension. 



2713. If the nerve becomes involuntarily negative, 

 then originates spasm. 



2714. If the nerve continue morbidly indifferent, then 

 paralysis originates. 



Nervous and Vegetative Systems. 



2715. The second great system is the tegumentary 

 formation. In this too its ordinary functions occur, 

 such as secretion, evaporation, nutrition, elevation or 

 depression of heat without nervous influence; or they 

 occur while the nerve only acts indifferently. 



2716. But if it acts by polarizing, as in the muscular 

 motion, then the tegumentary processes are at once 

 changed. What is material becomes extinguished, and 

 the simply Irritable is manifested in the cells, capillary 

 vessels, and so on. 



2717. The process of temperature becomes thereby 

 instantly changed, because the decomposition is changed. 

 The heat is increased by the rapid suppression of the 

 evaporation; it is diminished by the rapid increase of 

 the latter. 



2718. The art and manner in which the nerves act 

 upon what is vegetable, is consequently an elevation of 

 this Vegetable to what is animal. It must resign its 

 processes, and simply undertake those of motion. Exactly 

 the same takes place in the secernent organs. They per- 

 form their offices themselves through the galvanic tension 

 of the vessels. But if the nerve act upon them they secrete 

 more powerfully, and exactly from the same cause 

 whereby the muscle is self-moved. Thus, if the nerve 

 operate feebly, whereby it is in an irritable state, or if its 



