Dr. Bridges' Thought Projection

This is an interesting effect by Dr. Milton A. Bridges.

Performer shows a card, writes something on it, and places it in an envelope. He seals envelope and says that it is in his power to cause a person to think of what he wants them to think of. He says that he wrote a number on the card which he sealed into the envelope and he will cause a spectator to think of that number.

When he counts three, spectator is to call out first number that comes into his head. When number is called, performer opens envelope, removes card, and shows number on it to be the same as number called by spectator.