CENTURY VIII. 33 



749. Most of the hard substances fly to the extremes 

 of the body ; as skull, horns, teeth, nails, and beaks : 

 only the bones are more inward, and clad with flesh. 

 As for the entrails, they are all without bones ; save 

 that a bone is (sometimes) found in the heart of a 

 stag ; and it may be in some other creature. 



750. The skull hath brains, as a kind of marrow, 

 within it. The back-bone hath one kind of marrow, 

 which hath an affinity with the brain ; and other bones 

 of the body have another. 1 The jaw-bones have no 

 marrow severed, but a little pulp of marrow diffused. 

 Teeth likewise are thought to have a kind of marrow 

 diffused, which causeth the sense and pain ; but it is 

 rather sinew : for marrow hath no sense ; no more 

 than blood. Horn is alike throughout ; and so is the 

 nail. 



751. None other of the hard substances have sense, 

 but the teeth ; and the teeth have sense, not only of 

 pain, but of cold. 



But we will leave the inquiries of other hard sub 

 stances unto their several places, and now inquire 

 only of the teeth. 



752. The teeth are, in men, of three kinds : sharp, 

 as the fore-teeth ; broad, as the back-teeth, which we 

 call the molar-teeth, or grinders ; and pointed teeth, 

 or canine, which are between both. 2 But there have 

 been some men that have had their teeth undivided, as 

 of one whole bone, with some little mark in the place 



most admirable parts of the animal economy; the mode of development 

 of the two structures being wholly dissimilar, teeth growing by secretion, 

 and bones by intus-susception. V. Cuv. Eloye de Tenon. 



1 The marrow of bones is, of course, quite of a different nature from 

 either brain or the spinal cord. 



2 This sentence is copied from Aristotle, De Part. Anim. iii. 1. 



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