2015. Everything that is higher in its nature can only be developed out of that which is its direct antecedent, like the blossom from the leaf. Now the artery is the ultimate Vegetative. In this therefore, must the elements of the osseous, muscular and nervous systems reside. Now, the artery consists, of four parts, of the cellular, fibrous, dense serous coat, and of the blood. The cellular coat or tunic is the remnant of the whole tegumentary formation. The fibrous tunic is the embryo of the muscular system. The serous tunic is the embryo of the osseous system; for in old age it attains to ossification, bony lamellæ being deposited around it. The blood is the embryo of the nervous system. It is only requisite for it to coagulate, and it is then nervous mass. Nervous globules are blood-globules quiescent, or in a state of rest. Accordingly, in the artery, the whole body has been actually prefigurated or typified. 2016. Every animal system necessarily exists under a duplex character, being once in the service of the vegetative systems and once for itself; or it exists as trunk and as blossom. There is, therefore, a vegetative and animal nervous system, and, under such binary conditions, osseous and muscular systems likewise. 2017. All three systems are offsets from the arteries, and therefore their constant companions. The animal systems are called _flesh_. 1. NERVOUS SYSTEM. 2018. The nervous mass is coagulated blood. The nervous system is thus a higher arterial system. The highest arteries, however, are the air-tubes. The nerves therefore run parallel with the tracheal systems. 2019. What the tracheæ are for the vegetative body, namely, the vitalizing and motor principle, such are the nerves for both the animal and vegetative body. 2020. The nerves are distributed like the tracheæ of plants, in individual threads or filaments, which run near to each other arranged in a fascicular manner, and then mutually separate. 2021. The nervous filaments everywhere accompany the arteries, and, as far as their ultimate ramifications, like the tracheæ of insects pass to all parts of the body. 2022. The nervous mass has been separated into an arteriose and venous mass, the former being the cineritious or gray substance, the latter the medullary or white. The nervous system is therefore an entire blood-system, with two poles; it is therefore alive and active for itself, or independent of other systems. 2023. Both nervous masses are in a state of constant tension against each other, and consequently in constant tension with the whole body.