Anatomy, physiology and hygiene . the organic nitrogenous matters thrown off by the lungs? 9. To what is the term malaria applied, and what are some of the causes of malaria? 10. What gases corrupt the atmosphere, and which one is constantly present therein ? 11. Whence does the atmosphere derive its carbon di®xide, and why should so poisonous a gas be an essential ingredient of theatmosphere ? 12. WThen and where is it apt to be in excess, and what are the effects ? 13. What is to be said of carbon monoxide? of illuminating gas? of sulphuretted hydrogen ? of sewer gas ? 14. What other emanati
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Anatomy, physiology and hygiene . the organic nitrogenous matters thrown off by the lungs? 9. To what is the term malaria applied, and what are some of the causes of malaria? 10. What gases corrupt the atmosphere, and which one is constantly present therein ? 11. Whence does the atmosphere derive its carbon di®xide, and why should so poisonous a gas be an essential ingredient of theatmosphere ? 12. WThen and where is it apt to be in excess, and what are the effects ? 13. What is to be said of carbon monoxide? of illuminating gas? of sulphuretted hydrogen ? of sewer gas ? 14. What other emanations than the above gases devitalize the air? 15. What is to be said of damp building sites and of leaky drains and gas pipes ? 16. State the relative advantages of city and country life. 17. What are the effects of an impure atmosphere upon the health, and how may they be obviated ? Illustrate as to ventilation;as to the use of chemicals. 18. What effects follow a deprivation of light ? What its excess ? 270 THE NERVOUS SYSTEM.. Fig. 86. Posterior view of the spinal cord, a portion of the cerebrum and cerebellum, and some of thenerve* of the cerebro-spinal system. On the left side of the body some of the tissues areremoved to show the deeper nerves, while the right side shows certain superficial ones. CE. cerebrum. B, nerves distributed to the arm. SN, sciatic nerve. CEE, cerebellum. SC. spinal cord. CHAPTER XV. THE NERVOUS SYSTEM. 290. Predominance of Nervous Processes in Man.— Someof the processes already studied, viz., digestion, circula-tion, absorption, and respiration, are common to bothanimals and vegetables; but the processes by which con-sciousness, will power, voluntary motion, sight, hearing, etc., are accomplished are, so far as is known at present, peculiar to animals. One animal is superior to anotherin proportion to the number and development of thesefunctions. In man their number is the greatest andtheir development the highest, so that man maintainssupremacy o