Human Frame* 243 



by the internal powers of the machine 

 itself; many of which are not more cer- 

 tain and obvious in their effects, than they 

 are above all human comprehension as 

 to the manner and means of their opera- 

 tion. Thus, a wound heals up of itself ; 

 a broken bone is made firm by a callus ; 

 a dead part is separated and thrown off; 

 noxious juices are driven out by the 

 emunctories ; a redundancy is removed 

 by some spontaneous bleeding ; a bleed- 

 ing naturally stops of itself; and a great 

 loss of blood, from any cause, is in some 

 measure compensated by a contracting 

 power in the muscular system, which ac- 

 commodates the capacity of the vessel to 

 the quantity contained. The stomach 

 gives information when the supplies have 

 been expended, represents with great ex- 

 actness the quantity and quality of what 

 is wanted in the present state of the ma- 

 chine, and in proportion as she meets with 

 neglect rises in her demand, urges her 

 petition in a louder tone, and with more 

 forcible arguments. For its protection, 

 an animal body resists hea't and cold in 

 a very wonderful manner, and preserves 

 an equal temperature in a burning and i.i* 



