of Plants. 
+ $. Lafily, When the Acid predominant to the Alkaline, and the 
Sulphur to them both, a Blood-Red: which is the higheft and molt 
Sulpkurions Colour in Natur. 
24. $. Fromthe Premifes, divers Rules do alfo refült for the ma- 
king of Tindures, either for Medicines, O, t any other purpofer. 
25. $. I fhall only add one or two Not As firt, that of all 
Colours, Yellows are the moft fixed and unfading. As for inftance, if 
you drop either a Solution of Tartar, or of Spirit of Sulphur upon a 
Tinöure of the Yellow Flowers of Crowfoot, of Adonis, or of Saffron, 
neither of them will alter their Colour. Which thewes the ftrength 
of moft Yellows, to refift all manner of impreflions from the 4er, 
26. $. Again, that the ufe of Salts, is not only to highten or 
deepen Colours, but alfo to fix and make them permanent. As for In- 
ftance, The Tindure of Clove-July-Flowers, made either with. Water 
or Spirit of Wine being expofed to the Aer, will often turn into a 
Blackifh Purple. But the addition of a few drops of Spirit of Sulpkur, 
doth not only highten the Colour, but renders it {table and permanent. 
27. $. Likewife, of Salts themfelves there is choice to be made. 
For there are fome, which although they fix the Colour, yet, will a 
little give, as we fay, and not hold throughly drys as molt Lixivial 
Salts, and Stillatious Acids. But there are fome Salts, which will 
not give inthelealt, as Alm, that in Lime-Water and fome others 5 
which latter, is fo far from being moyftened, that it is rather petrified 
by the Aer. For which reafon I take it to be one of the beft Liquors 
for a ftable and permanent Green, and fome other Colours. 
28. $. Amongft all Water-Colours the rarelt, and moft dificult 
to make clear bright and permanent, is a Blew. There are many Flow- 
ers ofan excellent Blew, as thofe of Bug Lark-heeland others 5 but 
they cafily fade. And there are very few Flowers that will {trike in- 
to a Blemby any Liquors being almoft all changeable into Green, 
Purple or Red. Yet fome few there are, in which this Colour may be 
produced, As for inftance, the Flower of Lathyrus or Parfeverlafling 5 
which upon the affufion of Spirit of Harts Horn is changed from a 
Peach, to as pure a Blew, as the belt Ultramarine : that which hitherto 
is, 1 think, wanting in Water Colours. Spirit of Harts Horn was the 
Liquor I ufed; but | queftion not, but that other Alkalies, and par- 
ticularly Lime-Water, will have the like Effet, and fo render it the 
more ftable, 
29. $. From what hath been faid, we may likewife be confirmed 
in the uf of the already known Rules, and direéted unto others yet 
unknown, in order to the variation of the Colours of Flowers in their 
Growth. The effecting of this, by putting the Colour defired in the 
Flower, into the Body or Root of the Plant, is vainly tallsed of by 
fome: being fuch a piece of cunning, as for the obteii ing,a painted 
face, to eat good ftore of white and Red Lead. 
30. $. The belt known Rules are thefe Twos Firft, that the 
Seed be ufed above any other part, if the variation of the Colour be in- 
tended. One reafon whereof is, becaufe that part being but very fmall, 
the Tinöfures of the Soy! will have the greater over proportion to thofe 
of the seed. Befides, the tender and Virgin Seed, be mmitted to 
the Soy], will more cafily take any peculiar Tinöfsre from it, then an 
other 
