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difengaging themfelves from the exterior wrinkles 
above-mentioned, ran towards the center (Fig. D. «,). 
Hence it plainly appeared, that there is an affinity or 
connexion between the interior and exterior wrinkles. 
§ 1 8. To the exterior wrinkles, and to the whole 
outward l'urface of the hard part of the coral (Fig. D. 
1 1 , f, $,) there is clofely .attached a white or pale 
pellicle (Fig.' D. g, E. n y nj which is pretty foft, 
and compofed of vafcular and follicular minute mem- 
branes, which, by their interlacing, form a reticular 
body. The whole is accompanied with fmall vef- 
fels, which contain a whitifh juice, that is diffufed 
thro’ all the folliculi or membranulce ; which have 
alfo attached to them certain very fmall red corpui- 
cles, united together by means of other membranulce . 
§ 19. Thefe corpufcles are nearly of a fpherical 
figure, and, in fize and fhape exactly like thole of 
the allies of the coralline fubftance, and of the bark : 
fo that we may properly fay, that thefe little bodies 
conftantly remain intire, even after the action of the 
fire ; having undergone no other change but in their 
colour. 
§ 20. In this pellicle [E. ;z, «,) the globular cor- 
pufcles are not numerous, but the greatefl part of 
the faid pellicle is occupied by very white mem- 
branes, from which it takes its colour, and not from 
the red globular corpufcles. 
§ 21. This pellicle, lying immediately on the 
coral, depofits the red corpufcles, and adapts them 
to it : and thence it is, that the wrinkles are cover’d, 
as it were, by extremely little hemifpheres j and 
thefe infallibly fhew the formation of the coralline 
fubftance. If any one fhould ask, whence can thefe 
N 2 little 
