BURNING OR OXIDATION 



the blood vessels and nerves of the head and interfere with 

 normal brain development. Moreover they interfere in many 

 cases with the hearing, and in general hinder bodily growth. 



The removal of adenoids is 

 simple, and carries with it 

 only temporary pain and no 

 danger. Some physicians 

 claim that the growths dis- 

 appear in later years, but 

 even if that is true, the 

 physical and .mental de- 

 velopment of earlier years 

 is lost, and the person is 

 backward in the struggle for 

 life and achievement. 



How to build a fire. 



FIG. 27. Intelligent expression is often lack- 

 ing in children with adenoid growths. 



Substances differ greatly as 

 to the ease with which they 

 burn or unite with oxygen. For this reason, we put light ma- 

 terials, like shavings, chips, and paper, on the grate, twisting 

 the latter and arranging it so that air (oxygen in the air) can 

 reach a large surface ; upon this we place small sticks of 

 wood, piling them across each other so as to allow entrance 

 for the oxygen ; and finally upon this we place our hard wood 

 or coal. 



The coal and the large sticks cannot be kindled with a match, 

 but the paper and shavings can, and these in burning heat the 

 large sticks until they take fire and in turn kindle the coal. 



Spontaneous combustion. We often hear of fires " start- 

 ing themselves," and sometimes the statement is true. If a 

 pile of oily rags is allowed to stand for a time, the oily matter 

 begins to combine slowly with oxygen, and as a result gives 

 off heat. The heat thus given off is at first insufficient to 



