244 - the Animal Calculus. 
and forty three. From half a Pound of Ac- 
ton Water there remained twenty two Grains 
of very white Salt, e, in the Proportion of 
I to ij5>.2. And from a like Quantity of 
Ebjldam Water feventeen Grains, u e. in the 
Proportion of i to 20^.1. 
1 8. Ic is obfcrved of moft Spring and Well 
Waters, that the fuller the Springs are, by 
great Falls of Rain, the fofter they are : But 
when the Springs are at any time much fall- 
en, for w^ant of a Supply of Rain, then their 
Waters return to their former Hardnefs, which 
Quality v/e fee they are impregnated with from 
the blue Clays, and other Stratums which they 
pafs thro’. Whence we fee the Reafon of the 
common Obfervation, viz. that the Water of 
Springs when they are very low, is not fo good 
to brew with, as the Water of the fame Springs 
when they are high and full. 
i5>. Di:»Mcad in h\s Treatife of Poifons ukcs 
notice of a common Abufe committed about 
London, viz. “ in the choofing of ftagnating 
‘‘ impure JFdl JVatcr for the brewing of Beer^ 
‘‘ and making ocher Drinks. Such a Fluid 
indeed has oftentimes a greater Force and 
“ Aptnefs, CO extra£l the Tiniture out of 
‘‘ MeJt, than is to be had in the more inno- 
<( 
cent 
