TEMPERATURE OF APARTMENTS. 245 



utes, in such a heat, be thoroughly baked. 

 Water boils, as you know, at 212. 



Having laid down and illustrated the general 

 rule that the temperature of our bodies does 

 not vary much, it may be well to mention some 

 of those slight variations which, in different 

 circumstances, are found to exist. 



VARIATIONS OF TEMPERATURE. Infants, 

 except when just born, have a temperature of 

 only about 94. The heat increases to matu- 

 rity, after which it remains nearly stationary at 

 about 98, until we begin to decline, when it 

 again slightly diminishes. In the spring and 

 the beginning of summer, it increases a little, 

 in persons of every age ; but declines again 

 towards winter. When a person is greatly 

 enfeebled by sickness or otherwise, it is slightly 

 diminished. In fevers and inflammations, it 

 sometimes increases to 104, and even to 107. 



But I have not yet told you how this steady 

 temperature of 98 is kept up in the human 

 system, in spite of the extremes of heat and 

 cold. Indeed I cannot do it ; for I do not 

 know. I have already told you that the eva- 

 poration of the matter of perspiration on our 



