378 BIOLOGY. 



separated from the extensor layers, because the vegetable 

 flesh has as yet no symmetry in itself. 



2154. Plexors and extensors occur in pairs; because 

 the osseous system is in pairs. 



2155. There resides in the osseous and in the muscu- 

 lar system no cause for a diversity in the two halves of 

 the body. Thus, if there be a difference, it must only 

 reside in the asymmetrical galvanic systems. 



3. Organs. 



2156. Organs are parts of an anatomical system, 

 which separating, combine with a part of another system, 

 and thereby obtain a peculiar or special function. 



2157. For each system therefore there are as many 

 organs, as there are possible combinations of systems. 

 There are vascular, intestinal, pulmonary, sexual and 

 tegumentary organs, with furthermore, osseous, muscular 

 and nervous organs. 



A. VEGETATIVE ORGANS. 

 1. INTESTINAL ORGANS. 



2158. The intestinal or splanchnic system falls first 

 of all into three great divisions, into that of the viscera, 

 the sex and the head; the visceral intestine separates 

 moreover into pulmonic, venous and tegumentary intes- 

 tine, and this in constant accordance with its combina- 

 tions and functions. 



a. Visceral Intestine. 



2159. In the digestive system it is the chemical pro- 

 cess that takes precedence. This, however, divides into 

 three moments, into that of solution, separation sm& for- 

 mation, or crystallization, which is here absorption. Thus 

 the intestine separates also into a solvent, secernent and 

 absorbent intestine, and that indeed through its combi- 

 nation with the pulmonic, vascular and tegumentary 

 system. The ^solvent viscus is the stomach, the second 



