FIRE.
Take away that yellow surface which covers oranges and distill them in an alembic, until the distillation may be said to be perfect.
FIRE.
Close a room tightly and have a brasier of brass or iron with fire in it and sprinkle on it two pints of aqua vitae, a little at a time, so that it may be converted into smoke. Then make some one come in with a light and suddenly you will see the room in a blaze like a flash of lightning, and it will do no harm to any one.
VII.
PHILOSOPHY AND HISTORY OF THE ART OF PAINTING.
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.