Human Frame. 239 



its motions, as well as to protect some of 

 the more important and tender organs 

 from external injuries, there must be 

 some firm prop-work interwoven through 

 the whole ; and, in fact, for such pur- 

 poses the bones were given. The prop- 

 work must not be made into one rigid 

 fabric, for that would prevent motion. 

 Therefore, there are a number of bones^. 

 These pieces must all be firmly bound to- 

 gether, to prevent their dislocation ; and 

 this end is perfectly answered by thet/zg*- 

 aments. The extremities of these bony 

 pieces, where they move and rub upon 

 one another, must have smooth and slip- 

 pery surfaces of easy motion. This is 

 most happily provided for by the cartila- 

 ges and mucus of the joints. The inter- 

 stices of all these parts must be filled up 

 with some soft and ductile matter, which 

 shall keep them in their places, unite 

 them, and at the same time allow them 

 to move a little upon one another ; and 



* Dr. Kezll reckons 245 bones in the human 

 body, others make them to be 249, viz. In the 

 skull 14, in the face and throat 46, in the trunk 

 67. in the arms and hands 62, and in the legs and 

 fcet 60. 



