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 preponderating 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.
2135. The arterial heart is the central, the venous heart the peripheric.