Human and comparative anatomy, physiology, and hygiene . d of re-cesses in schools ? Remark. — Young and feeble persons require morefrequent change of position than old and strong per-sons. This is particularly true with children, if growingrapidly. Q. What persons need the most frequent change of position ? 282. The color of a muscle depends upon the colorof the blood. If that is white, the color of the muscleis white. If it is red, the color of the muscle is red. Q. Upon what does the color of a muscle depend ? 283. Pure blood is essential to the health and strengthof a muscle. If the air of
Human and comparative anatomy, physiology, and hygiene . d of re-cesses in schools ? Remark. — Young and feeble persons require morefrequent change of position than old and strong per-sons. This is particularly true with children, if growingrapidly. Q. What persons need the most frequent change of position ? 282. The color of a muscle depends upon the colorof the blood. If that is white, the color of the muscleis white. If it is red, the color of the muscle is red. Q. Upon what does the color of a muscle depend ? 283. Pure blood is essential to the health and strengthof a muscle. If the air of a room is impure, the bloodbecomes impure ; consequently the muscles are soon ex-hausted, and Ave feel restless. Q. What is necessary to the health and strength of a muscle ?What condition of the blood causes exhaustion and restlessness1 MUSCLES. 117 Remark. — The restlessness of children in a schoolroom may be diminished or removed by ventilating the room. Q. How can the restlessness of children in the school room bediminished 1 Fig. 92. Fig. Fig. 92. An improper, but not an unusual, position when 93. A proper position when writing. 284. The muscles should be gradually called intouse, if we do not wish to weary them too soon. Thisremark should not be forgotten in driving horses andother animals. Q. How should we use the muscles ? What remark in reference to driving animals ? 285. After hard work or severe , the musclesshould be rested gradually and the kin thoroughlywashed or rubbed. This principle also applies to horses. (See p. 120.) 118 REVIEW LESSON. Ficr. 94. Ficr. E.
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