150 LECTURE III. 



one can observe the figure without at once 

 perceiving, that it is far better calculated 

 for cleansing the Augean stables, than for 

 catchino; the stag of QEnoe. 



Many of the bones which compose the 

 skeleton are connected together without 

 admitting of motion upon one another ; 

 and in this case, portions of elastic gristle 

 are interposed between them to prevent 

 jarring, and they are tied together by un- 

 yielding and exceedingly strong ligaments. 

 When bones move upon one another, when 

 a true joint is formed, the corresponding 

 surfaces of each bone are covered by gristle, 

 which is exquisitely smooth or polished. 

 Between these smooth surfaces, a liquor, 

 like white of egg, is effused to prevent their 

 adhesion, and to facilitate their motion. 

 The escape of this synovial liquid from the 

 joint is prevented by capsules ; and the 

 bones are firmly tied together by ligaments 

 of surprizing strength, which are so con- 

 trived as freely to admit those motions that 

 the bones are adapted for, and to prevent 

 any other. All the parts composing the joints 



