. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . Fig. 53. Various forms of nerve-cells. The cerebrum is divided into two parts by a naturalfissure in the middle line, passing from the front back-wards. From this it would seem that we have twobrains, — a right brain and a left brain. But at thebottom of this fissure the halves are united by a bandof nervous tissue (Fig. 55, 3) ; so doubtless their actionis in some way connected. The ridges, or convolutions,of the cerebrum vary in different animal
. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . Fig. 53. Various forms of nerve-cells. The cerebrum is divided into two parts by a naturalfissure in the middle line, passing from the front back-wards. From this it would seem that we have twobrains, — a right brain and a left brain. But at thebottom of this fissure the halves are united by a bandof nervous tissue (Fig. 55, 3) ; so doubtless their actionis in some way connected. The ridges, or convolutions,of the cerebrum vary in different animals. As a rule,the more intelligent the animal, the more numerous arethese convolutions; the deeper the depressions betweenthem. 11 162 A HEALTHY BODY. The Weight of the Brain. The brain of the elephant isthe heaviest known, which weighs from eight to tenpounds. The brain of the whale comes next, whichweighs from six to eight pounds. The average weight. Fig. 54. The human brain, viewed from above : only the cerebrum is seen. of the human brain is, for the male, a trifle over threepounds, and for the female, about one third of a poundless. THE NERVOUS SYSTEM. 1G3 Something more than Brain needed. It seems sometimesthat a man may have a large and fine brain, a healthybody, and be in every way fitted to succeed in life, andyet lack the desire to put his powers into action. Wesay such a person has no ambition. He is disposed to
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