S motion of thofe creatures found in water wherein pep- 
per has been infos'd. He dbferves likewife that the 
ireflinefs and quicknefs of luch Ferruginous waters gis are 
lighter then common water, are much loft in the remo- 
val. Neither will the waters themfelves have thofe Ef- 
fedls thej would at the fpring head, or before their re- 
moval. He diilikes the divifion of Mineral roaters into 
jicidtila &c Therms ^\i2Lvm^ by feveral tryalls found, that 
there is not a manifeft Acidity in thofe waters that are 
not Sulphureous or hot j luppofing alfo, that they may 
in all probability have (pent the Acidity they had, upon 
the Iron Ore, which they diifolv'd in their pafTages ; nei- 
ther does he think any of our purgative waters contain a 
Salt that belongs to any one known fort of Salts i but is 
either of a fort for which we have yet no name, or elfe is 
of a compounded Nature, fince two bodies, neither of 
which is Cathartic\y may by a change of texture com- 
pofe a third body briskly purgative j of which he has 
given an Example; he adds that (as far as hehasob- 
lerv d, ) thofe Ferruginous waters, that are not heavier 
then common water,and in moft drinkers prove but Diu^ 
retic\y afford very little Caput mortuum^ or dry fub- 
ftance,up®n the total evaporation of their liquor;where- 
as Mineral waters that are purging , and manifeftly more 
ponderous iny/?m> then common water, leave a confi- 
derable Quantity of Refidence. ex. gr. A poundof^^r- 
net water ("which is purgative,)y ielded one dram of white 
powder. A pound of T«»^r/<^3^^ water yielded Capimort^ 
about gr. i. Twenty five ounces of German fpaw water 
gave but — gr. iff. Neither need fo fmall a Quantity feeni 
inconfiderable, fince upon tryall one part of Marcafite 
did communicate a Tind:ure to 6i^\o parts of the infu- 
fion of Galls; and upon Computation one grain of 
Vitriolate fubftance might impregnate 6000 times its 
weight of common water, fo as to make it fit to produce 
with Galls a purple colour. To all which laftly is fub- 
M m 2 joyn d 
