m 
iliall fay ho more of, they being nothiiig 
elfe but either petrify’d or calcin’d Shels 
of animals. ' 
The Third Sort is of luch as in their 
figure alone, refemble thofe, that were 
newly difcours'd of, but for the reft to¬ 
tally differ from them,feeing that in them 
are to be ifound neither the little Shels, 
nor the Thireds, much iefs the diverfity 
oftheThreds. Of thefc fome arc Ae^ 
reai.i iomc Lafideomi of either a black 
or yellow colour 5 others o- 
thers Chr^fialUn% , others of other mat¬ 
ter; the ;prodU(ftion of all which I ex* 
plain in jmanner following/ 
'Where the penetratingiorce of juyces 
hath dilfolved the fabftance of the Shell, 
the fam^ juices being either drunk up by 
the Earth have left the fpaees of fliels 
Void f which T call Shels ,) or 
being altered by new adventitious mat¬ 
ter, have,aceording to the variety of that 
matter, fill’d up the fame fpaees of fliels 
either with Chryftal,0r Marble,or Stone.* 
Whence comes that very pretty kind of 
Marble called Nephiri^ which is nothing 
elfe but a fediment of the Sea full of all 
forts of Shells, where the fubftance of 
the 
