240 On the Animal Calculus. 
Spar and the like, communicate but little of 
thefe Qualities, in comparifon of what fome 
fofcer kinds of Stone, Chalk, blue Clay or 
the like do. 
12. Yet there are fome Waters which de- 
pofite no tartarine Incruftation in the Veffels 
they are boifd in ; fuch is the Water which 
is convey’d in a Pipe, for the publick Ufe of 
the Inhabitants of Hodjdon in Hertfordjhire^ 
which rifes from a Gravel, and boils up thro’ 
a fine white Sand ; which has no Incruftation 
in a Boiler that has been ufed for fifteen 
Years: And fuch is the Water with which 
Mr. Serjeant Baynes*s finely fituated Houfe at 
Havering Hill in Ejfex is fupplied with ; 
the top of that Hill whence it flows, and 
on which the ancient royal Bower flood, be- 
ing Gravel 5 whence as alfo from Sand the 
pureft Spring Water has been obferved to 
flow, if it have not firft pafl'ed thro’ Strata 
that it can diflblve. Such alfo is the Water 
which his Majejlfs Palace at Hampton Court 
is fupplied with, which leaves no Incruftation 
in the Coffee-houfe Boiler, that has been in 
conftant Ufe for fourteen Years : It has the 
fame Qtiality at the Fountain Head at Mr. Har- 
veys at Comb: And it is the fame with the 
Waters, 
