C4 3 



bars would scarcely suffer at all were the foot to 

 remain unsliod. 



The following is a section of a foot crosswise, 

 shewing the relative thickness and situation oF 

 the crust, sole, and frog. 



It must be admitted as a general fact, that tht 

 greatest part of the weight of the body is sup- 

 ported by the shoe ; and it must be equally ob- 

 vious, that this support will be tlie more effectual 

 the greater the surface on which it rests. 



It happens, however, that the parts of which 

 the bottom of the foot is composed, cannot all 

 bear the same degree of pressure without being 

 injured; hence, therefore, it becomes necessary 



