PAGE 1. What is the object of respiration? 123 2. What are the special organs of respiration? 123 3. In what organs does a change in the blood take place? 123 4. What is the nature of the change? 123, 133 5. Where are the lungs situated, and what is the character of the substance of which they are composed? 123, 125 6. Describe the facilities provided for the lung movements. 124 7. Describe the trachea, or windpipe. 124, 125, 127, 128 8. Describe the bronchial tubes, and their uses. 125, 126 9. What can you state in relation to the epiglottis? 126, 127 10. What are the cilia and what use do they probably serve? 128 11. How may the lungs be affected by not being properly protected? 128 12. Describe the movements necessary to the act of perfect respiration. 128, 129 13. What is the diaphragm, and what is its office? 128, 129 14. How may the organs of respiration be so improved as to increase their capacity and power? 129, 137 15. What is stated in relation to the frequency of respiration? 129, 130 16. To what extent may the act of respiration be subjected to our wills? 130 17. What may be said to be the capacity of the lungs? 130, 131 18. How long does it take every particle of air in the lungs to be expelled and new air to take its place? 130 19. What would be the consequences, if the entire capacity of the lungs were constantly used? 130, 131 20. What would be the consequences to a fish put into water from which the air had been completely exhausted? Why? 131 21. What is the air, and what are its parts? 131, 136, 138 22. What is the character of the air that has been just breathed? 132 23. Why is it that such air is not fit for respiration? 132, 139 24. What are the effects, as recorded in notable cases, of confinement in places the air of which has been breathed "over and over?" 133 25. What can you state of changes in the blood from respiration? 133 26. What of the air, as an article of food? 133, 134 27. What, on the subject of interchange of gases in the lungs? 134 28. Explain the difference between arterial and venous blood. 134, 135 29. Explain, if you can, the cause of the difference. 135 30. State what you can in relation to blue blood. 135 31. In relation to the amount of labor exerted in respiration. 135, 136 32.