[10 54.31 
the firft part of the propofed work. He hath given like- 
wife a Scheme ofTitles for the fecond part: But becaufe 
the lecond part is that which he mainly defigned, he 
referr d to it two other Sediions vtt!(.. the fourth and fifths 
In the firft of which he give$ Experimental Remarks up- 
on the way o{Exd,i^inmg Mineral waters by the help ol 
Galls J the ufe of which he approvjes of rather in .powder 
theninfufionj but, for the more effectual courfe of ei- 
ther way, gives this caution, that the TinBure be not 
long drawn, nor the Galls tbemfelves grown ftale. He 
cannot by any means think Galis (ov the Infirfion there- 
of,) to be of that ufe and certainty, that it is Vugarly pre- 
fum'dtohave, in as much as it only difcovers a liquor tdi 
be or not to be, either of a Vitriolatt/oz Ferruginous na- 
ture ; for there are diners metaUihe Orer-a^^^ oAer Mii 
neral bodies whiclvriot participating bfl nbt^by^ 
this means bedifcover d, and yet m^^ fame time 
ftrongly inipregnate the water propofed ; the decodioa 
of Arfenic for example, changes no more upon Galls, 
than would common water. Moreover unlefs Iron b6 
the only predominant Mineral in tht'p^triolated waterj 
theinfufion of Galls does not anfwer it, for upon a ftrong 
Solution of /^'mW (where Copper is the only^ or 
at leaft the predominant metal) tkb^^lnrufidti, or Tin(3:ure 
of Galls afforded neither a black nor biackifk colour, only 
a thick and muddy one, that was not fd^ much as pur- 
pliQi. And though the Author be, for certain reafons 
unwilling to fet down a way to difcover in a trice both 
thefe Vitriols without any liquor or tangible body, yet he 
has been fo candid as to lubjoyn as a juccedaneum» the 
way of making a liquor that will prefently tura 
black with a folutiou of Alartial or Cupreous FitrioL 
In his fifth SecStion (confifting of Annotitibris and 
Notes on other Articles of the fame fecond part) he ob- 
fcrves, and brings his Ocular demonftration for the life 
...... ^ 
