Magic Writing.
Present a person with a slip of paper, a pen and a tumbler of water, and desire him to dip the pen in the tumbler, and write down whatever he pleases. When dry, the words will be invisible, but, if the paper is immersed in the contents of the tumbler, the writing will make its appearance quite distinctly. To perform this the pen should be a quill one, and new, and the water in the tumbler should have one or two crystals of sulphate of iron (green vitriol) previously dissolved in it, while the writer should be careful the pen does not get dry in use. When the writing has been executed, the tumbler should be taken away, on pretence of the water being rather dirty, and wanting changing; another similar tumbler is brought back, filled to the same height with water, in which a few drops of tincture of galls have been poured. When the paper is immersed in this, the writing will quickly appear.