THE MUSCLES 53 



PAGE 



16. What, in relation to physical strength ? 38 



17. What, in relation to physical degeneracy ? 38, 39 



18. What, in relation to the importance of exercise ? 39 



19. What is the effect of exercise upon the heart, skin, and appetite? . . 39, 40 



20. How does exercise affect the current of the body's circulation ? 40 



21. How does judicious exercise affect the muscles ? 40 



22. What is stated of violent and spasmodic exercise ? 40 



23. Of the exercise of walking? 41 



24. Of running, leaping, and other modes of exercise ? 41, 42 



25. Of physical culture, in connection with out-door exercises ? 42 



26. What are the results of excessive exercise ? 43 



27. Of the importance of gymnastics in our schools and colleges ? 43, 44 



28. Of the importance of rest from labor or exercise ? 47 



29. What processes take place during sleep ? 48 



30. What about the amount of sleep required ? 48 



31. What effects follow insufficient sleep ? 48 



32. Illustrate nature's demand for sleep 48 



