66 HEAT 



lime-water and olive oil should be kept in every kitchen. 

 If limewater is not at hand, use baking soda and olive oil. 



Any of the following materials may be used for 

 burns: baking soda, olive oil, limewater, white lead and 

 linseed oil, powdered chalk, cornstarch, laundry starch, 

 flour of any kind, mucilage or dissolved gelatine covered 

 with any of the powders mentioned above. Since quick- 

 ness means much to the patient, ease in obtaining the 

 remedy should have first consideration. 



There is another danger which is connected with 

 burns because the skin is usually destroyed. This gives 

 the bacteria a chance to enter and produce trouble for us. 

 To overcome these little plants we must bathe the 

 affected parts with some material which is an antiseptic, 

 that is, something which is against the poisoning. We 

 should do this whenever we break our skin by any means. 

 There are many antiseptic washes to be obtained in drug 

 stores and the proper kind can always be obtained. 



Heat is harmful to bacteria if the temperature is 

 212 F. Where articles are known to contain bacteria 

 they may be killed by keeping them at the boiling point 

 of water for twenty minutes, or a shorter time at a higher 

 temnerature. 



26. Conduction of Heat. 



When we use a stove-poker for a few minutes, the 

 part which we are holding becomes uncomfortably hot. 

 We call this travelling of heat along an object, conduction. 

 Tf the heat reaches the cold end quickly, we say that the 

 material is a good conductor. 



If we put a wooden handle on our poker, we may 



