83. How constant is the need of air? What is the vital element of the air? Describe the action of the oxygen in our lungs. What does the blood give up? Gain? What are the constituents of the air? What are the peculiar properties and uses of each?
84. How can we test the air we exhale? What does its analysis reveal? Which is the most dangerous constituent? What occurs when we rebreathe exhaled air?
85. Describe its evil effects. What is denoted by the "Black Hole of Calcutta"? Give other illustrations of the dangers of bad air. Describe the need of ventilation. Will a single breath pollute the air?
86-95. How can we detect the floating impurities in the air? What is the influence of a fire or a light? Of a hot stove? When is the ventilation perfect? What diseases are largely owing to bad air? Should the windows and doors be tightly closed, if we have no other means of ventilation? Is not a draught of air dangerous? How can we prevent this, and yet secure fresh air? What is the general principle of ventilation? Must pure air necessarily be cold air? Are schoolrooms always properly ventilated? What is the effect? Are churches? Are our bedrooms? Should children or delicate people sleep in cold rooms? Can we, at night, breathe anything but night air? Is the night air out of doors ever injurious? Ans. In times and places of malaria, and also in very damp weather, it should be avoided, even at the risk of bad air in doors. Describe some of the wonders of respiration.
96. How is constriction of the lungs produced? When may clothing be considered tight? What are the dangers of tight lacing? Which would make the stronger, more vigorous, and longer-lived person, the form shown in A or B, Fig. 33? Is it safe to run any risk in this dangerous direction?
97. What is Bronchitis? Pleurisy? Pneumonia? Consumption? What is one great cause of Consumption? How may a constitutional tendency to this disease be warded off in youth? Ans. Besides plenty of fresh air and exercise, care should be taken in the diet. Rich pastry, unripe fruit, salted meat, and acid drinks should be avoided, and a certain quantity of fat should be eaten at each meal.—BENNETT. What is asphyxia? Describe the process for restoring such a person. (See p. 264.)
98. What is diphtheria? Its peculiarities? Danger? The croup? Its characteristics? Remedy? (See p. 260.) Causes of stammering? How cured?
297. How does the singing voice differ from the speaking voice? How can you prove the effect of duration of sound in speaking and singing? How do the intonations of the voice affect the meaning of words?
298. Give illustrations of speech in persons without a tongue. What is the effect of alcohol and tobacco on the throat? Do they have an influence on the voice? Does the excessive use of tea and coffee ever affect the voice? How? To what is the hoarse tone of an inebriate due?
299, 300. What was Adelina Patti's advice with regard to stimulants and late hours? Does the respiration of woman differ from that of man? Give experiments with Indian women. What lessons do we draw from these facts? What rule should be observed in regard to the size of a bodice? What are bacteria or microbes? How is their existence revealed? What does the Germ Theory of Disease teach in regard to microbes?