CHAPTER XVII. 



TEMPERATURE OF APARTMENTS. 



Curious Question. Variations of Tem- 

 perature. 



FEW if any ordinary buildings, whether 

 dwellings, shops, or factories, are so constructed 

 as to preserve exactly the same temperature 

 in every apartment and at all seasons. And 

 as for heating themselves in this manner, by 

 the very employments or manufactures which 

 are carried on within them, nobody probably 

 ever heard of such a thing. A self-heating 

 house ! Why it would excite as much aston- 

 ishment as would a machine which should 

 really have the power of perpetual motion. 



And yet the house I live in has this power, 

 wonderful as it is, of not only heating itself by 

 the process of generating and purifying blood, 

 of which I have treated at a great length, and 

 by others curious processes, but of regulating 



