Then the metamorphoses proceeded. Oranges were changed into pots of marmalade, and given away to the boys, and a chest of tea was converted into a tray carrying a steaming teapot, sugar, milk, cups of tea, and handed by the attendants to the ladies in the _reserved_ seats only—such is the blighting influence of cash, which caused the one-shilling people to be neglected and the eighteenpenny-reserved-seat folks to have their teas. The ghost of Banquo in “Macbeth,” and the ditto in “Hamlet” followed, with the curious change of a deserted piano into one at which played and sang a living member of the fair sex, attended by a gentleman in faultless black coat and white tie, who turned over her music; and this Part. I wound up with the change of a gentleman into a lady, who walked down to the foot-lights, sang a song, and then vanished into “thin air.” But all these changes could only happen in the smaller inner apartment, the actors might walk anywhere else at pleasure, and out of the charmed circle Walker could not change to Pepper, or the latter refer to the living beings when they faded out of sight as regular “Walkers.” So much for what was done, and now the anxious reader is getting impatient, and if a lady is doubtless curious (the poor men never are so) to know how it was all done, and as the illusion has apparently left the domain of optical science and is now relegated to the conjuring profession, the author has no hesitation in fulfilling his long-ago promise made to the public to let, as Mr. Cremer, jun., says in his most amusing book on “Conjuring,” the cat out of the bag. Before the illusion can please the eyes, the proper apparatus for producing it must be constructed; and the key to the result consists in the use, not of clear plate glass employed in the ghost illusion, but of engraved silvered glass. Ordinary looking-glass, such as is used for common mirrors or looking-glasses, is usually made by attaching an amalgam of tin-foil and quicksilver to one side of a clean sheet of plate or other glass. Glass prepared in this way cannot be successfully engraved, and when the chisel or other tool is drawn with pressure across it, is liable to chip; and instead of clear, sharp engraved lines being obtained, they are ragged, and, in most cases, large patches of the amalgam are torn off.