"Every perception is to some degree an act of creation, and every act of memory is to some degree an act of imagination."
-- Gerald Edelman, Second Nature: Brain Science and Human Knowledge
10 Of colours vide pag 6912 Of colours vide pag 69Of colours vide pag 69The Newton Project Knowledge Graph2020-10-08Journal
46 That the colour of a body bee altered by a cleare liquor tis commonly required that it have salt yet faire water powred on the grey & friable calix of powdred Vitriol melted by a gentle heate till it colour change & the liquor being set by in a close violl for some days it will tune to a vitriolate colour
47 Take Lignum Nephriticum (the infusion of which in faire water is good against the stone of the kidneys) put a handfull of thin slices of it into 3 or 4 pound of pure spring water after it hath infused there a night put the water into a cleare violl, & if you see the light through it it appeares of a golden colour (excepting sometimes a sky coloured circle at the top) but if the infusion was too strong the liquor will then appeare darke & reddish. But if your eye is twixt the liquor & light it appeares ceruleous: & Acid salts destroy the blew colour & sulphureous saltes restore it againe, without making any change in the golden colour. Which may bee usefull to the finding whither bodys abound more with acid or sulphureous Salts.