250 RESPIRATION AND EXCRETION 



21. What are the advantages of the vacuum cleaner over other 

 forms of sweepers? 



22. How can you tell when the air of a room becomes bad? 



23. Why should considerable water be drunk every day? 



24. Of what use is perspiration to the body? 



25. How would you keep the skin clean? 



26. Give facts to prove that the skin gives off waste products. 



27. What is the relation of the heat of the body to work done 

 by the body? 



28. What is the physiological use of (a) the cold bath, (6) a 

 moderate bath, and (c) a hot bath? 



29. Why do we feel more oppressed on a hot humid day than on 

 a hot dry day? 



Refekencb Books 



Hunter, CiTiic Biology, Chap. XXII. American Book Company. 



Hunter, Elements of Biology, Chaps. XXIII, XXIV. American Book Company. 



Hunter, Essentials of Biology, Chap. XXVII. American Book Company. 



Baum, Conscious Control of the Diaphragrn. Musician, May, 1914. 



Brady, How He Held His Breath. Technical World, July, 1914. 



Conditions Inducing Excessive Respiration. Scientific American, July 11, 1914. 



Davison, Human Body and Health. (Advanced.) American Book Company. 



Gulick, Hygiene Series, Emergencies, Good Health. Ginn and Company. 



Hough and Sedgwick, The Human Mechanism. Ginn and Company. 



Howell, Textbook of Physiology. The MacmiUan Company. 



Long, Physiological Chemistry. P. Blakiston's Son and Company. 



Macy, General Physiology. American Book Company. 



Ritchie, Human Physiology. World Book Company. 



