ZOOGENY. 375 



2123. The tegumentary muscles lie under the skin, 

 and are inserted into it, or into the dermo-osteous 

 system, when such an one is present. If the fibrous 

 membrane be strongly developed under the skin, then it 

 receives the name of a Panniculus carnosus. 



2124. The intestine has also its fibrous coat, which, 

 upon the stomach, anus, and oesophagus, is frequently 

 developed as a panniculus carnosus. 



2125. The same holds good of the vessels, especially 

 of the arteries and trachea. 



2126. The fibres are either elongated or else annular 

 fibres. The latter obtain the preponderance at the ex- 

 tremities of the tubular formations, as on the oesophagus, 

 anus, lips, and eyelids. 



2127. We have consequently a dermal, splanchnic, 

 and osseo-muscular system. 



b. Animal Muscles. 



2128. In the oxydizing part of the vascular system 

 the formation of fibres must be preponderant over that of 

 cells, and thus at the root of the lungs. 



2129. The vessel becomes in the lungs a fleshy cavity. 

 The fleshy vessel is the heart. 



2130. The heart is a vascular fragment, with a pre- 

 ponderating development of fibrous membrane. 



2131. This fibrous membrane is developed at a spot 

 where all vascular systems enter into mutual proximity, 

 such as the respiratory ducts and the intestinal lymphatic 

 vessel, the artery and the vein. 



2132. In the union of all the highest galvanism is 

 attained, and then the formation may launch out into 

 what is animal. 



2133. The heart is the animal in the plant. 



2134. The first heart is an arterial heart. There is 

 originally no venous heart. In the embryo, particularly 

 in that of the bird, this is extremely distinct ; the arterial 

 heart also emerges for the first time, and per se, in the 

 lowest animals, in the Molluscs, Snails, and even in the 

 Fishes, although in the latter it is regarded as a venous 

 heart. 



