30 GENERAL SCIENCE 



active circulation of the blood in all parts of the body, and whatever 

 contributes to the general good health, aids in the prevention of colds. 



Exercises 



1. To what is the color of candle and lamp flames largely due? What is the 

 nature of the " smoke" from chimneys? 



2. What significance has the presence of carbon dioxide gas in the breath? 



3. In ventilating rooms and buildings, what special attention must be given 



(a) to economic considerations; (b) to danger to health? 



4. What is meant by a flame? Why is there greater danger of accident in 

 the use of gasoline than of kerosene? 



5. State some ways of showing that the interior of a candle flame is not afire. 



6. In which parts of plants is carbon dioxide gas changed chemically into 



material for plant structure and nourishment? What relation to this 

 change has sunlight? 



7. Why is there need to give less attention ordinarily to the ventilation of 

 living rooms by day than by night? Why is there need of more attention 

 in winter than in summer? 



8. In tuberculosis of the lungs what at present is the only hopeful course of 



treatment? When only is this successful? What conditions in living are 

 conducive to this ailment? 



9. About what on an average is (a) the rate of respiration; (>) the capacity 

 of the lungs; (c) the per cent of the lung capacity employed at a breath? 



10. What advantages (a) in the gradual change of the air in the lungs; (b) 

 in the retention in them at all times of considerable air? 



11. What good purpose is served by habitual deep breathing? What are the 

 ill effects from habitually failing to inflate the lungs fully at every breath? 



12. Describe the steps to be taken for the resuscitation of a drowned person. 

 Give the reason for each step. 



13. What is the apparent relation between vigorous exercise whether as work 

 or play, rapidity of breathing and of heart action, and the temperature of 

 the body? 



14. In what sense does perspiration "regulate" the temperature of the body? 



15. What is the meaning of the terms {a) congestion; (b) inflammation? 



16. Why is there risk to one's health from damp feet or clothing when not 

 exercising? 



17. What relation apparently exists between temperature maintained in the 

 body and the continuance of life activities? Explain this. 



18. What is the purpose (a) of the digestion of food; (b) of the oxidation of 



portions of it? 



