( M '- i ) 
of Oyfters , there is no doubt but that they have one and 
the fame Salt Particles, and confcquently that their Ope- 
rations are uniform. 
For my farther fatisfaftion, and for want of thofe Oy- 
Jler-Shells , in which Pearls are to und, I took two Shells 
that had been for four Years together nailed upon the 
Bulk, of a Man that fells Oyflers 5 upon a fuppofition, 
that I fhould find no kind of Salt Particles in fuch Shells, 
and moreover, that they were as dry as the Pearls them- 
(elves. 
The biggeft of thofe Oyjter-SheUs I judged to be fix 
Years O/d, and that the thickeft part of it wasfomething 
more than one fixth of an Inch. 
I fplit this Oyfter-Shell. and obferved feveral Scaley Par* 
.tides of it to be of a Chining whitenefs, fomething like 
what we call Mother of Pearl $ and when I view’d thefe 
Particles with* my Microfcopa, I obferved that the little 
Scales, of which the Oyfler-Shell is compofed, to be as 
thin as thofe that Pearls confift of. 
Yea, I judged that the Scaley Particles of the Oyfler * 
Shells lay as many times upon one another, as the Oyfler 
was days old : In another place inftead of Scaley Parti- 
cles, there was nothing but (as it appeared to the naked 
Eye) a white Chalkey Matter. 
Thefe Scaley Particles are compofed of exceeding 
fmaii Veffels, by which they certainly receive their en- 
creafe from the Fifh, and which extend themfeives fo 
many feveral ways, that it was impoflible for me to foT 
low them with my Eye : Now, as I Paid before, it is 
poffibie that from an over-flowing of Nourifhment, &c. 
there may be fuch a matter protruded, as fhall afterwards 
be coagulated and turn it feif into a hard Globular Fi- 
gure. 
Moreover, I took fome of the inmofi: fplit Particles 
of the Oyfler -Shelly which were very clean and white, 
and put them upon a Fire of Charcoal, and having made 
them 
