This is a very useful little dodge, as by its means the machinations of the obnoxious person in this book denominated Mr. Interference may be defeated. It is only requisite when it becomes absolutely necessary to convince the company that you do not know the position of the card in the pack. It is necessary to get at least a portion of the card in the hand, when, from the upper side, an indentation is made in the card with the thumb nail, one of the fingers, on the under side, performing the office of pressure pad. The card need not be removed from the hand of the chooser, the performer merely touching it momentarily whilst explaining what he wishes done. It is as well to make the mark near the centre of the card, as then it is more easily found. After it has been made, the pack may be given the company, the card placed in it, and the whole well shuffled by anyone. The card will at once be recognised by the slight projection that has been made on the under side. Should a repetition of the ruse become necessary, the performer must either leave the card originally marked out of the pack, or else make two marks on the next; but it is better to leave the first one out. As the whole of the pack is not used—at least, not under my instructions—some spare cards are always lying unused upon the table. This spare heap is always exceedingly useful, as cards such as the one under notice may be placed in it, whilst others, which may be presently wanted, can lie upon the top, ready at hand.