THE SKULL. 



of the crown of the head gives it great strength. This 

 you will realize if you take an egg by its ends between 

 finger and thumb, and try to crush it: you will find that 



Tsp 



Md 



FIG. 6. Side view of the skull. Pr, parietal bone; 0, occipital bone; T, tem- 

 poral bone; S, sphenoid bone; f, frontal bone; Z, malar, or cheek-bone; N, nasal 

 bone; , ethmoid bone; L, lachrymal bone; MX, upper jaw-bone; Md, lower jaw- 

 bone. 



lustrate. Describe the outer layer of the bones on the sides and top 

 of the brain. The next. The innermost. To what may this ar- 

 rangement of the skull-bones be compared ? 



