PAGE 1. What can you state of the number and division of the muscles? 25, 26 2. Describe the structure of the muscles. 25, 26 3. Their arrangement in pairs and consequent action. 26 4. What is the difference between the motion called flexion and that called extension? 26 5. Describe their action, and state which are the more powerful. 26 6. What is the difference between voluntary and involuntary muscles? 26 7. Illustrate the difference between the two. 26 8. State all you can of the tendons or sinews. 27 9. What is meant by contraction of the muscles? 27, 28 10. In how many and what ways may contraction be effected? 28 11. What is stated of after-death contraction? 28 12. Why cannot a muscle in life continue contracted a long time? 28 13. How then can the constant beating of the heart be explained? 28 14. How does the strength of a man compare with that of a horse? 29 15. What can you state in relation to the relative strength of animals? 28, 29 16. What, in relation to physical strength? 29 17. What, in relation to physical degeneracy? 29, 30 18. What, in relation to the importance of exercise? 30 19. What is the effect of exercise upon the heart, skin, and appetite? 30, 31 20. How does exercise affect the current of the body's circulation? 31 21. How does judicious exercise affect the muscles? 31 22. What is stated of violent and spasmodic exercise? 31 23. Of the exercise of walking? 31, 32, 33 24. Of running, leaping, and other modes of exercise? 32 25. Of physical culture, in connection with out-door exercises? 33 26. Of the importance of gymnastics in our schools and colleges? 33, 34 27. Of the importance of rest from labor or exercise? 38, 39 28. What processes take place during sleep? 39 29. What effects follow insufficient sleep? 39 * * * * * {41} CHAPTER III. THE INTEGUMENT, OR SKIN. _The Integument--Its Structure--The Nails and Hair--The Complexion--The Sebaceous Glands--The Perspiratory Glands--Perspiration and its Uses--Importance of Bathing--Different kinds of Baths--Manner of Bathing--The Benefits of the Sun--Importance of Warm Clothing--Poisonous Cosmetics._ [Sidenote: 1. What is the skin? Parts directly beneath? What is shown?]