24 HEAD. 



juttings out between the bones, and by which they 

 are interlaced, are observable only upon the outer sur- 

 face, which belongs to the tougher, woody bowl of 

 the skull. On the internal surface, the pieces are 

 laid together in a manner more nearly approaching a 

 smooth line. This mode of joining is called by anat- 

 omists, harmonia, or harmony. The same joint, and 

 the same name for it, are used by architects in mason- 

 ry. This is pronounced remarkable, because it is so 

 plain, that, while the superior toughness of the exter- 

 nal surface will better admit of uniting by a dovetail 

 edge, as carpenters do in their work, the brittle na- 

 ture of the inside is not so suitable for this species of 

 joint : " as if a workman in glass or marble," says Dr. 

 Bell, " were to enclose some precious thing, he would 

 smooth the surfaces and unite them by cement, be- 

 cause, even if he could succeed in indenting the line 

 of union, he knows that his material would chip off 

 on the slightest vibration." Such is the ingenious 

 and provident structure of the skull. 



Fie. 2. 



b, one of the joints upon the internal surface of the skull. 



B. One would think anatomists must be the most 

 devout persons in the world, when they know so 



