. True manhood : a manual for young men . hard to make him learneven then what is w^anted. These talkative carpenters have secrets of theirown, some tricks of the trade, that they keep to them-selves, and after we have been all through their shopswe shall not be able to imitate their work, even tomaking one single fibril of a fiber of a muscle. Yetwe may learn many interesting points. As elsewhere,the muscle cells are in all stages of formation, and inturn are superseded by others. Their product is nota secretion, and like bone cells they need no color they are of a beautiful red. They
. True manhood : a manual for young men . hard to make him learneven then what is w^anted. These talkative carpenters have secrets of theirown, some tricks of the trade, that they keep to them-selves, and after we have been all through their shopswe shall not be able to imitate their work, even tomaking one single fibril of a fiber of a muscle. Yetwe may learn many interesting points. As elsewhere,the muscle cells are in all stages of formation, and inturn are superseded by others. Their product is nota secretion, and like bone cells they need no color they are of a beautiful red. They possesscontractile power. By this curious property theycontract and expand in obedience to the will. Thisis as strange and wonderful as anything in nature—■and for practical use is unexcelled by any propertiesof organized matter. TRUE MANHOOD. 147 The vermiform motion of the stomach and intes-tines is caused by the contractile muscle fibers of themiddle layer of their walls and the action of theheart is sustained by the same Fig. XXXIX. Muscles of the front figure. Muscles are of various forms and sizes, in thinlayers, in rings, in strips, in thick piles, fan shaped. ,48 TRUE MANHOOD. feather shaped, etc. They are bound firmly to thebones by white, hard, tough bands and cords, calledtendons. Strength is essential to muscles, for by them are con-trolled the powerful movements of the must also be soft and yield readily to these reasons the furnishing of the proper nutri-ment is essential. Iron, potassium, chlorine, magne-sium and sodium feed the muscles well. Phosphorusand sulphur give swiftness and life for the contractileproperty. Muscles use up the larger portion of the food weeat. From the celb of blood they extract oxygen,magnetized iron and phosphorus; the plasma yieldsthem albumen. The deltoid muscle of the shoulder has powerenough in it to raise i,ooo pounds. The reason thearm cannot lift so much is not for lack of inherentstrength
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