16. Is there any truth in the proverb that "he who sleeps dines"? 17. What does a high, wide forehead indicate? 18. How does indigestion frequently cause a headache? 19. What is the cause of one's foot being "asleep"? [Footnote: Here the nervous force is prevented from passing by compression. Just how this is done, or what is kept from passing, we can not tell. If a current of electricity were moving through a rubber tube full of mercury, a slight squeeze would interrupt it. These cases may depend on the same general principle, but we can not assert it.--HUXLEY. The tingling sensation caused by the compression is transferred to the foot, whence the nerve starts.] 20. When an injury to the nose has been remedied by transplanting skin from the forehead, why is a touch to the former felt in the latter? 21. Are closely curtained windows healthful? 22. Why, in falling from a height, do the limbs instinctively take a position to defend the important organs? 23. What causes the pylorus to open and close at the right time? 24. Why is pleasant exercise most beneficial? 25. Why does grief cause one to lose his appetite? 26. Why should we never study directly after dinner? 27. What produces the peristaltic movement of the stomach? 28. Why is a healthy child so restless and full of mischief? 29. Why is a slight blow on the back of a rabbit's neck fatal? 30. Why can one walk and carry on a conversation at the same time? 31. What are the dangers of overstudy? 32. What is the influence of idleness upon the brain? 33. State the close relation which exists between physical and mental health and disease. 34. In what consists the value of the power of habit? 35. How many pairs of nerves supply the eye? 36. Describe the reflex actions in reading aloud. 37. Under what circumstances does paralysis occur? 38. If the eyelids of a profound sleeper were raised, and a candle brought near, would the iris contract? 39. How does one cough in his sleep? 40. Give illustrations of the unconscious action of the brain. 41. Is chewing tobacco more injurious than smoking? 42. Ought a man to retire from business while his faculties are still unimpaired? 43. Which is the more exhaustive to the brain, worry or severe mental application? 44. Is it a blessing to be placed beyond the necessity for work?