The Relation of Science and Religion.pdf - Online Christian Library

216 SCIENCE AND RELIGION.tinous substance, in the outer layer of whichthey are fewer in number; approaching theinterior, they become more numerous; andthey are both more abundant, larger in size,and more distinguished by the number of theirprotoplasmic * fibres as they lie nearer to themass of nerve fibres. In this crowd of nervecells are the stores of nerve energy suppliedto the nerve system, with every exercise ofwhich molecular changes in the brain are believedto take place. On this account theremust be regular and ample supply of nourishmentfor the brain, for which such provisionhas been' made that, according to Haller'scomputation, one fifth part of the whole bloodsupply goes to the brain.Regarded as the great central organ, thebrain is divided into two halves or hemispheres,from each one of which goes forthsupply of nerve fibres and nerve energy forthe opposite side of the body. Its greatestdepth is in the central part, the front andback being rounded down, the frontal regionbeing, however, considerably more massivethan the rear. Besides this great central body,there are several dependent subordinate bodies,* Protoplasm, see Appendix VII.