THE CUPOLA. 79 



Like the rest of the bones, the teeth consist 

 principally of earthy substance I mean lime. 

 But at first, we can hardly be said to have 

 bones in us of any kind. Some have begun to 

 be a little solid, others have not. Where the 

 bones afterwards are, we find a piece or lump 

 of something which is nearly transparent, and 

 more like jelly than bone. This in time ossi- 

 fies, that is, becomes solid ; and forms bone, 



GROWTH OF THE TEETH. The teeth, as 

 well as the other bones, are at first pieces of 

 jelly. They do not appear at birth, for they 

 are in the jaw-bone. And what may seem 

 strange to you, the lumps of jelly-like substance 

 which make both sets of teeth, (those which 

 are shed early and also those which come after- 

 wards in their place,) are there ; one near the 

 edge of the jaw-bone, and the other a little 

 deeper within it. 



It will greatly help you in understanding me, 

 if you will examine the following engraving. 

 It shows the teeth as they appear in a child, 

 before he has shed many of the first set. 



