The performer comes forward with a glass of port wine in his hand. He then explains the convenience of being a conjuror, since one can always accommodate one's friends. For instance, here is a glass of port wine. The friend to whom it is proffered does not happen to care for port. In the ordinary way the wine would be wasted; but not so with the conjuror. All he has to do is to borrow the friend's handkerchief (here a handkerchief is borrowed), and, waving it thus over the glass, see, the wine has changed to sherry! But the friend does not like sherry either. What does he like, then? A little spirit? Yes! Gin, perhaps? If you please. The handkerchief is once more waved over the glass, and the sherry turns to gin, which the company are welcome to prove by the ordeal of taste.
The secret of this trick lies in two pieces of coloured glass, shaped thus: ??? so as to fit perpendicularly into a wineglass. One piece of glass is yellow, to represent sherry, and the other red. The performer advances with the glass full of gin, and the two glasses placed in it. The red and the yellow commingling produce the tawny port colour. It need hardly be said that the edges of the glasses must never be towards the company. The first time the handkerchief is placed over the glass the red glass is abstracted, leaving the yellow, which is removed on the second occasion. The glasses are most easily palmed. Provided with his glasses, the performer will find this a handy trick to perform extempore at the houses of friends, where water might be used if gin were not handy, or else very pale whisky. It is not of sufficient importance for the stage.