_A red ground for Etching._ Take red lead, grinde it very well, and temper it with varnish. _A white ground._ Take one ounce of Waxe, and two ounces of Rosin, melt them together, and adde thereto a quarter of an ounce of Venice Ceruse ground fine, lay it on while it is hot. _A blacke ground._ Take Asphaltum two parts, Bees waxe one part; melt them together, and being warme, lay it on very thinly with a fine lawne ragge. If it seeme somewhat red in any one part, hold it over the smoake of a Linke or waxe candle, and it will be amended. Note that it is a principall thing in this Art to lay the ground on aright. _Another way how to engrave with water._ Take Verdigrease, Mercury sublimated, vitreoll, and allum, a like quantity, beate all to powder, put them into a glasse, and let it stand so halfe a day, and stirre it often, then lay on the plate, waxe, mingled with Linseed oyle, or red lead with Linseed oyle, and write in it that you meane to grave, then put the water on it, and let it so remaine halfe a day, if you will have it very deepe, let it lye longer. If you will engrave Images, &c. lay the waxe on the Iron or Steele, thin, and draw what you will theron, that it may touch the mettall, then put the water into the strokes, and it will be engraven. _How to engrave on a flint stone._ Take a Flint, and write on it what you will, with the fat or tallow of an Oxe, afterward lay the flint in vineger, foure dayes. _FINIS._ ------------------------------------------------------------------------ [Illustration] Place this betweene folio 14. and 15. ------------------------------------------------------------------------ THE BOOKE OF EXTRAVAGANTS: Wherein amongst others, is principally contrived divers excellent and approved Medicines for severall maladies. By I. B. [Illustration] _LONDON._ Printed by _Thomas Harper_, for _Ralph Mab_. 1634. ------------------------------------------------------------------------ [Illustration] To the Reader. _Courteous Reader, forasmuch as there were divers experiments that I could not conveniently, or rather my occasions would not permit me to dispose in such order as I would have done; I thought it would not bee amisse to call them by the names of Extravagants, and so to set them downe as I found them, eyther inserted amongst other my notes, as I put them in practise, or as they came into remembrance._ ------------------------------------------------------------------------