ZOOGENY. 359 



a. Vegetative Nervous System. 



2025. The vegetative nervous system is the nervous 

 mass that has remained behind, after the greatest part 

 of it has become converted into tegumentary formations. 

 Now, as these tegumentary formations, being surrounded 

 in the higher animals by flesh, were thus viscera, so 

 may the vegetative nerves be called also Visceral or 

 Splanchnic nerves. 



2026. These visceral nerves govern the vessels, the 

 intestine, and lung ; with the sexual parts also, yet in 

 their case in combination with the animal nerves, because 

 the sexual parts are at one and the same time organs of 

 vegetative and animal life. 



2027. These visceral nerves everywhere accompany 

 the vessels, and are therefore like these distributed in a 

 cystic manner between intestine and skin. They form 

 a large cyst which concentrically surrounds the in- 

 testine. 



2028. They do not, however, like the intestine, form 

 any closed cyst, but only a cystimorphous net, like the 

 vessels. 



2029. The two nervous masses are in them separated 

 from each other, like as the branchiae have been distri- 

 buted along the whole body and separated from the 

 intestine. The gray or branchoid substance has sepa- 

 rated itself from the white medullary substance into in- 

 dividual ganglia, or as it were into individual nervous 

 branchiae. The medullary substance has also retained 

 its connexion though only in a ramular manner, and not 

 uninterruptedly like an integument. It is called plexus. 



2030. The ganglia and the plexuses stand in mutual 

 opposition, like the branchiae and intestine, like artery 

 and vein, like blood and lymphatic vessels. The ganglia 

 oxydize, polarize; they are the active. The plexuses 

 suffer, digest, and are the recipient. 



2031. The visceral nerves, like the viscera, act for 

 themselves, being unconcerned for the animal systems. 



2032. The visceral nerves have a vegetable sensation 



