NATURAL THEOLOGY. 133 



rising motion ? The contrivance which a mechanic 

 would have employed is that which is actually adopt- 

 ed. The tendon of the muscle passes up from the 

 breast, above the wings, and is there inflected 

 through a ring or,.pulley, and fastened to the top of 

 the wing bone, and is thus enabled to perform the 

 service required. 



Fig. 25. 



d, and c, the two pectoral or Ireast muscles dissected and raised 

 from the breast bone a : d, being the larger muscle for draw- 

 ing down the wing ; and c, the elevating muscle. The ten- 

 don of c, is represented above the wing joint at/, elevated by 

 a pin and inserted into the wing bone, a short distance from 

 the joint. 



B. How curious to notice the exact resemblance 

 in the manner in which the gaff of a vessel is drawn 

 up on which the sail is spread, and that which is here 

 employed in raising and expanding the wing ! 



M 



