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perforation. I had Indeed my doubts of this on firfl: 
examining them, becaufe, on a very flight alteration 
of the delicate focus of fo high a magnifier, the light 
and dark parts would interchange, fo that the re- 
fradtion or refledtion of the light might flill be 
fufpedted to occafion the appearance in quefiion : but 
continuing my view ftedfaftly, and taking notice of 
all the diverfities which a numerous colledlion of 
globules prefented, I remained at lafl thoroughly con- 
vinced that they were perforated j for, when any of 
the globules happened to move with the ferum in 
the moft perfedt focus, which could not happen to 
all, in a medium of fome little depth, I could with 
great clearnefs diftinguifii the exterior and interior 
circumference of the ring, of which each globule 
confifted ; the interior one being bounded by a black 
line or fhade next the perforation, exadlly refembling 
that which bounded the exterior one, and diftin- 
guiflaed it from the ferum without. In fuch globules 
I could alfo eafily obferve the ring to be articulated, 
the tranfverfe lines at the joints being very difiinguifh- 
able. The figures of the articulations were various ; 
in fome they were roundifli, fo that the ring ap- 
peared like a bead necklace; in others, cylindrical, 
and of fome length. The number of which the whole 
was compofed, fe.emed uncertain, varying from two 
or three to fix or feven ; many of the rings were 
broke, either by fome confinement of the talks, or 
by beating againfi; each other, which I faw them 
continually doing ; and by thefe accidents the joints 
of the rings were detached, and wandered about fe- 
parately in great numbers ; and indeed they appeared 
ieparable with as much eafe as if they had been united 
