C 730 ) 
trochi fbap d in raw Clay before they have attain d the confi- 
fteocyof a Stone ; and thefe, if laid in the Sun, become light 
and fpungy likea pumex, 1 took up there a piece of another 
ftrange Srone, of thelikefparry fubftance^ 'tis about the big- 
nefsof a Wallnut, hollow, and fiU'd with the faid Clay 5 ic 
fomewhat refembles a Helmet j the fore-part of it is faiooth,the 
upper parr,w hich hasa large ridge in the middle, is all wrought 
with little rings,three at a place , encircled within each other. 
The Stone call'd Cprm Ammonis^ fliap'd like a Rams- horn , is 
very frequent in this day ;the largefl I have is feven inches in 
length, four inches in compafs at the broad end, and two and a 
ha'f at the fmall end ; the cop being broken off. Tracing its O- 
riginal, I find fome of the firft buddings out of it about the 
bignefs of a young Cocks-fpur, and very much like it. I have 
fome in raw clay, and one growing from a white Cawky-ftone. 
They generally become at lafta whitifli Spar, and fome milk- 
white as feme of the TwA/V^j are:There are of all intermediate 
proportions betwixt thefc two,though very few of any bignefs 
are to be found entire,but all broken and imperfeft pieces: And 
I take the CeQimugfummitates of Mr.LiJler to be only little elTays 
of Nature towards the produflion of this Stone, the alliance 
being evidently nearer than betwixt them and the Trochites.Thc 
texture of thefe Stones is thusrSome have maffy fpar in their in- 
fides, which takes up three parts of the Stone ; then from the 
£harp top there grow thin flat cells, or fmall pipes of Spar, fee 
edge- ways, one clofe to the other, all round the Stone , which 
fiioot towards the broad end, and appear outwardly like fmall 
ridges or feams and many of thefe pipes, running down thus 
afcer the ftone, fhew their hollows,fome at one place of it,fome 
at another,and fome not^ill they come to the broad end : And 
this is the texture of the great Stone,which has rings alfo,though 
fomewhat defac'd, running round it, tending likewife in their 
growth towards the broad end as in a Rams- horn. Moft of the 
lefTcr ftones have very little maffy fpar within them, and fome 
have none, but appear fomewhat hollow at the broad end, with 
cells coming down inwardly from the top of the ftone, refem- * 
bling thofe in the flowers ofCoral, which terminate its branches ; 
anddoubdefs, if taken from their beds in a feafonable time, 
would yield theiike milky- juyce 5 for I find in the Cells offome 
broken pieces of thefe ftones an evident concretion of fucha 
milky 
