144 Of Bone s* 
ner as to let out what was contained in the 
VefTel, but differ Nothing to return into it*. 
It may poffibly be conceived by fome, 
44 fays Dr. Grew, that the Bones, at lead 
** fotne of them, are hard at the drd : as 
Saits and other cryftallizing Bodies are as 
te hard upon the very firfh Infcant of their 
Shooting, as they are when grown into 
4t large Cry dials. But it is fo far evident 
* e that all the Bones are foft at the fird, that 
I am of Opinion, they are originally a 
44 Congeries of as true Fibres or fibrous Vef- 
,c i els as any other in the Body ; which by 
44 Degrees harden into Bones, in like Man- 
ct ner as the in mod: Veffeis of a Plant do in 
** Time harden into Wood, And as in a 
** Plant there are fucceffive Additions of 
ts Rings or Tubes of Wood, made out of 
* s Veffels ; fo in an Animal, it feems plain 
44 that there are Additions fucceffively made 
to the Bones out of the fibrous Parts of the 
Mufcles j efpecially thofe whited: Fibres 
4( which run tranfverfely, and make the Sta- 
men or Warp of every Mufcle. So that, 
€t as in the Bark of a Plant, Part of the Vef- 
fels are fucceffively derived outward to the 
44 Rind, and Part inward to the Sap, which 
44 afterwards becomes hard Wood; fo, in the 
44 Fleffi of an Animal, Part of the white 
44 tranfverfe Fibres are fucceffively derived 
* Pbilo/oph y tfranf' Numb. 366. 
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