Mere suggestion, accepted without question, has almost unbelievable power over individuals. A few months ago, an Eastern chemistry professor tried an experiment. He held up a vial la belled “Violet Perfume” an asked his students to raise their hands as soon as they could detect the odor. Fifteen seconds after he had removed the cork, every hand in the front row was up, and in less than a minute three-fourths of the class signaled they could smell the perfume.

The bottle contain nothing but water.