IV.' Of Hydatides inclofed with a Stony Cruft in 
the Kidny of a Sheep, ©y Mr W. Cowper, 
F. % S. 
I N the Sheeps Kidny, which was ordered at a late Meet- 
J. ing of the Society, to be fet afide for me to examine, f 
found a large whitilh body, inclining to yellow, and ting’d 
with red, as it lay under the Membrane of the Kidney, vid. 
Tab. I. Fig. i.A. This was very hard.asis ufual in Animal 
Petrifaftions, 2 thirds of it lay hid within the fubftance of 
the Kidney : It was inclofed with a thick hard Membrane, 
thatcould not eafiiy be feparated from it, even with a Nee- 
dle fixt in the end of a Stick. The Branches of the Emul- 
gent Veins and- Arteries, lay between it and the Pelvis of 
the Kidney y all which Vejjels were fomewhat preft 
by this petrified Body. As I was picking off its thick 
ftrong Membranous Inclofures, I found the Needle flip 
into a cavity at ah Aperture Fig. II. By this I was in- 
form’d ( <?f what 1 muft confefs, before I had no fufpi- 
cion of) that this, hard and heavy Petrifyed Body was 
hollow, whereupon I thought of dividing it with a Saw, 
but finding a Membranous Interdice in it, Fig 2, B. I 
pull’d it afunder, as expreft Fig. III. and found its infide 
divided by many Petrifyed Cells C.of irregular Figures, and 
fill’d with Hydatides,i ome of which are reprefented at D. 
This uncommon appearance fat leaft to me) of a Pe- 
trifyed Crujl inclofing Hydatides, l thought deferv’d the 
Figu re s annext. 
Tab. I. Fig. I. 
The external Surface of the Kidney of a Sheep. 
A. The Petrifyed Body as it appear’d in it before diffeftion. 
Fig. 
