6» ^he Contmts of fome Letters from 
TvfQ learned and curious Obfervers in 
Staffordfliire , concerning the Sand 
ffbund in the Brine o/'r/;^ Saltworks of 
that Country &e. tothe Royd 
: S S<^i<^f3^,4|'%^^ Plot. S, R. S. 
IJAyit^ h^^ QCcafiba aBouthalf a yeai? fince to confi- 
* *dei^^ty\Brm^j" white Sakhcit in 
England; md more particularly thofe of Staffordjhire \ I 
cqnfuked amongft others that inftruftive difcourfe of 
Mr. John Collins concerning ^alt and Fijhery then newly 
publifb't; wherein finding Pag. 52. that thofe great 
quantities of Sand met with in all Brines* whether of 
Fits, made of Sea liquor, or by melting of forreign SaltSs, 
are not in the Brines before they are boy led, but produced 
i?<.f?Ij^.9f petrification during the Evaporation^ which 
He confirmes by the Experiment of ftrong iBnw^^ 
been dreyned or fqueezed through moft pure fine Holland 
of eight foldings* and no fymptoms of any &W being 
left in the Filtre: I thought it of concern tome (though 
then at a great diftance my felf^ to have the Experiment 
repeated upon the staffordjhire Brine^ not only becaufe 
W|tl6 i^ticular acc©u^^ was then giving of it, but ra- 
ther for the fake of tlie great quantities of Sand I knew to 
come from that Brine, which I was inclin d to believe would 
either quite overthrow, or mightily confirm the truth 
of that odd Phmomenon, Whereupon I made bold to 
r^queftthe afliftance of tm Curious Olfervers^ Neighbors 
V- " ^ -"'^ ' ' to. 
