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with the Oyl of Vitriol Dyes a Purple. All theses Colours stand. 5. Onthe Tops of Muscus Tubulosus, so call’d by Mr. Ray in his late Catalogutof the Plant s of England, are certain Red knots; thesi, upon the Affusion ofLye, will strike a Purple, and stand.

As for the Latent Colours in Vegetables and Animals, to be Difcovercd tous by the Affusion of Saks-, they likewise, no Doubt, are verymany. Wewill sit down only aFew Instances in both kinds, which have not been,that we know of, Difcovered or taken notice of by others. 1. Latent Vege •table Colours. i. The Milky Juice of LaBuca Sylvestris costd Spinosa, andSonchus Asper and Levis, upon the Affusion of Lye, will strike a VividFlante-Colour, or Crimfin, and aster some time quite Degenerate into a Dirty2 ellow. L. The Milk of Cataputia minor, upon the Affusion of Lye, efpe-cially if it be drawn with a Knife, and bath any time stood upon theblade of it, will strike a Purple or Bkod-Red-Colour, and by and by Changeinto an Ignoble 2 ‘ellow. a» Latent Animal Dyes. 1. The CommonHawthorn-CaterpiUar will strike a Purple, or Carnation, with Lye, andStand. 2 . The Heads of Beetles and Pifmires , &c. will with Lye strikethe fame Camatim-colour and Stand. 3. The Amber-coloured Scolopendrawill give with a Lye a most Beautiful and Pleasint Azure or Amethystine,and Stand.

Lafily, we roight consider the Fixing of Colours for use: but we are wil-ling to leave this to more Experienced Perlons. Some obvious Inferenceshowever we may Venture to take Notice of. 1. That in all the Instancesabove mentioned, whether Vegetable or Antmal, there is not one ColourTruly Fixed; I fay, Truly Fixed, that is, Proof of Salt and Ftre: For,what seems to Stand and be Lye-Procf, are either wholly Destroyed by aDifferent Salt, or Changcd into a much Different Colour ; which must needsprove a Stain and Blemilh, when it (hall happen in the Use of any ofthem.a. That both the Apparent and Latent Colours of Vegetables are Fixable:An Instance whereof we may obscrve in the Seed husks of Glastum ; andthe Use Dytrs make of the Leavtt aster due Preparation. z. It is probablefrom the fame Instance, that we may learn from the Colour of some part ofthe Fruit or Seed, what Colour the Leaves of any Vegetable and the fVbclePiant might be made to Yield for our Use. 4. That the Latent Colours of Ve-getables are Prae-existent, and not Produced; from the sime Instance of IVoad,and likewise from this that the Milky Juice of LaBuca Sylvestris doth af-ford it ftlf a Red Serum. 5. That the Change of Colours in Flowers is Gra-düal and Constant. 6 That the Colours of Flowers, which will not Standwith Lye, scem to be wholly Destroyed by it, and Irrecoverable. Thusit happens in the Experiment, that one part of a Violet Leas, upon the Af-fusion of Lyt, is Cbanged very soon into Yellow, and will never be Revivedinto a Red by any Acid Salt ; but if another part of the sime Leas be stiliGreen, it will be Revived. 7. That the Drynesi siems to be a Means,if not of Fixing , yet bringing the Vegetable Colour into a Conditionof not Wholly and Suddainly Perisliing by the otherwise DestroyingAlealy. 8. That those Piant s 01 [Animals that will Strike Different and

yet