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8. Respiration. 



(a) Organs connected with respiration. 



Heart, arteries, capillaries and veins. 



(b) Organs used in respiration. 



Pharynx, glottis, epiglottis, vocal chords, larynx, trachea, 

 bronchial tubes, air cells and blood vessels. 



(c) Chemistry of respiration. 



Plants: inspiration carbon dioxide, expiration oxygen. 

 Animals : inspiration oxygen, expiration carbon dioxide. 

 Amount of work done by plants. 

 Amount of work done by animals. 



9. Necessity of Air. 



(a) Fatal results of poor air; no air. 



Asphyxiation. 

 Drowning. 



(b) Necessity of ventilation in 



School room. 



Churches. 



Theaters. 



Cars. 



Sick rooms. 



Hospitals. 



Factories. 



Mines. 



HEATING. 



1. Wood. 



2. Coal. 



(a) Life history of trees and plants. 



(b) Food of plants. 



Carbon dioxide. 

 Water. 

 Nitrogen salts. 



(c) Free oxidation of fallen trees and leaves. 



(d) Slow oxidation of fallen leaves covered with water. 



(e) Subsidence of carboniferous forests. 



(f) Deposition of soil. 



(g) Transformation of plant material into coal, 

 (h) Upheaval of submerged area, 



(i) Mining of coal. 



(j) Use of coal as fuel. 



(k) Liberation of the sun's energy as heat. 



3. Natural Gas. 



(a) Origin. 



(b) Source. 



