ZOOGENY. 3()1 



the nerves, as the two vascular membranes are the vege- 

 tative walls of the blood. The skin, as branchia, incloses 

 all, like the cellular membrane does the vessels. 



2039. As the intercostal ganglia give off ramules to 

 the plexuses, so does the spinal marrow ; there are the 

 spinal nerves. The spinal marrow is, first of all there- 

 fore, the coalescence of the two intercostal nerves. 



2040. These spinal nerves are, however, animal 

 plexuses, which partly encroach upon the visceral nerves, 

 and partly pass to the animal systems. 



2041. There are therefore two kinds of spinal nerves, 

 vegetative and animal, and as many of them as there are 

 divisions in the viscera and in the animal systems. 



2042. The nerves pass off symmetrically from the 

 spinal cord, because the nervous mass belongs to the 

 symmetrical osseous system. They form therefore rings 

 both anteriorly and posteriorly. 



2043. The nervous system does not consist of indi- 

 vidual cysts, like its two animal teguments, or bone and 

 flesh. It is at one time the type or image of the vascu- 

 lar trunk and its ramifications ; at another the indiffer- 

 ent sether-mass, which does not crystallize ; it is lastly 

 the organic primary mass that has remained persistent, 

 and must thus be coherent in texture. It is the blood 

 continually streaming from the animal divisions of the 

 heart. 



2044. The whole animal nervous system is a tegu- 

 mentary cyst with tubes passing off from it symmetrically 

 in the form of rings. 



2045. The spinal cord cannot be the highest. It has 

 only the lowest signification, in so far as it stands in the 

 service of the viscera and the sense of touch, and thus 

 follows the position and arrangement of the bones. Thus 

 the spinal cord is first of all an osseo-nervous mass. 



2046. The nerves, as running for the most part/w- 

 wards, are musculo-nervous mass ; those running back- 

 wards or outwards are tegumentary or sensitive nerves. 

 This signification is imparted also by the physiological 

 function of these two divisions of nerves. The nerves 



