Experiment XXVII
Among other Vegetables, which we thought likely to afford Exceptions to the General Observation about the differing Changes of Colours produc’d by Acid and Sulphureous Salts, we thought fit to make Trial upon the Flowers of Jasmin, they being both White as to Colour, and esteem’d to be of a more Oyly nature than other Flowers. Whereupon having taken the White parts only of the Flowers, and rubb’d them somewhat hard with my Finger upon a piece of clean Paper, it appear’d very little Discolour’d. Nor had Spirit of Salt, wherewith I moisten’d one part of it, any considerable Operation upon it. But Spirit of Urine, and somewhat more effectually a strong Alcalizate Solution, did immediately turn the almost Colourless Paper moisten’d by the Juice of the Jasmin, not as those Liquors are wont to do, when put upon the Juices of other Flowers, of a good Green, but of a Deep, though somewhat Greenish Yellow, which Experiment I did afterwards at several times repeat with the like success. But it seems not that a great degree of Unctuousness is necessary to the Production of the like Effects, for when we try’d the Experiment with the Leaves of those purely White Flowers that appear about the end of Winter, and are commonly call’d Snow drops, the event, was not much unlike that, which, we have been newly mentioning.