( * 4 *? ) 
them glowing hot, I threw them into clean Rain Wa- 
ter, whereupon the Particles of the Shell were feparated 
from one another, and appeared like Meal or Chalk 5 and 
prefently after, I obferved a Scum overfp-eading the Su- 
perficies of the Water, which increafed and grew thicker 
from time to time, and which plainly appeared to be no- 
thing elfe than the coagulated fait Particles ; and when 
this Water had hood three Days, there was fuch large 
fait Particles coagulated, and compofed of fo many fe- 
veral Figures, and fo clear, that ’twas a Pleafure to be- 
hold them $ and tho after that time, by flirting and 
breaking that Scum, I had caufed it to fubfide to the bot- 
tom of the Water, and had poured more frefh Water 
upon the laid Particles of the Oy/ler-Shell , there fucceed- 
ed quickly after a new Scum, but it was not near fo thick 
as the firfl. 
Now if the common Ojfkr-Shcll has fitch an Analogy 
with the Particles of Pearls, we cannot doubt but that 
Shell which produces Pearls has yet a much greater like- 
nefs, fo that we may well conclude, that Pearls are of 
no real ufe in Phyfick - r and wTto knows , that racft 
of thofe Phyficians who put fuch a value upon Pearls % 
Gold or Silver , with refpect to their ufe in Medicines, did 
ever fet themfelves, to make a nice enquiry into the 
Powers of them, but only contented themfelves with a 
fervile imitation of others. 
Furthermore, I took fome of the inmoft pans of the 
faid 'Oyfler-Shell, and proceeded with them after the fame 
manner as l had done before, with the broken Pearls $ 
that is to fay, I boiled them in Rain Water, and obferv- 
ed likewife that the faid Water had no Scum upon it. 
i caufed this Water to evaporate, and then obferved 
more fait Particles in that than in the Water above-men- 
tioned $ and thefe Salts were fo foft,that my warm Breath 
alone was fufheient to turn them into a Vapour. 
| Vbes 
1 
