( 9 6 ) 
harder to the Bone than I could have imagin’d, and 1 
obferv’d, that a great many Particles of this Membrane 
were left on cleaving to the Bone. This I did with 
defign to make fome Obfervations on the fuperficial 
part of the Bone, which is not near fo hard as thofe 
bony Particles, that lie a little deeper. From this Bone 
I cut off fome very thin dices, both along the Bone, 
and likewife tranfverfly, one of which I placed before 
a Microfcope, and gave it to the Painter, that for 
many Years has drawn all my Obfervations. 
This Piece is reprefented by A B K C> Fig. ha- 
ving been cut off tranfverfly, and as thin as poflible, 
from the Rib, with part of the Periofteum, as from K 
to C, (till adhering to the Bone, and another part of it 
torn off from the Bone, as defign’d by B K D, except 
that in fome places the Bone and the Membrane are 
ftill united by Veflels torn out of their places, that 
run from one to the other. In this Figure D E F C 
reprefents the Periofleum , and the part defign’d by 
EGHIF, is fomething lying upon it, which l could 
not te l what to make of, tho’ it appear’d to me to be 
Membranous, 
I had likewife fome very thin dices fliaven off from 
the Rib both of an Ox, and of a Calf, from which [ 
tore off the Periofteum entirely, or at lead as much of 
it, as podibiy F could ; after which I caufed the edge 
of the Bone it had duck to, to be reprefented by the 
crooked Line, L M N t Fig. 6. 
In Fig. 7. OP Q reprefents the edge of another fmall 
dice of Bone, from which the Periofteum has been torn 
off, by which appearance it lhould feem, that the 
Union of the Periofteum with the Bone is fo firm and 
drong, that, in feparating it, fome of the fuperficial 
Particles of the Bone are torn off with it. 
I have 
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