When we consider single notes or sounds - their effect upon the physical body leads us to think deeply on the subject. There are snake charmers, mostly to be found in India, who by playing their instrument, a wind instrument called pungi, attract cobras and other snakes from their vicinity. Often and often this experiment has been made, and one has always found that all kinds of snakes, or cobras, are attracted on hearing the sound of the pungi. First they come out of the holes in which they live and there is a certain effect on their nervous system which draws them closer and closer to the sound of the pungi. They forget that instinct which is seen in every creature to protect itself from the attack of man or of other creatures. At that time they absolutely forget, they do not see anyone or anything. Then they are aroused to ecstasy: a cobra begins to raise its head and to move it right and left, and as long as this instrument is played the cobra continues to move in ecstasy. This shows us that, apart from the psychical effect and apart from the spiritual effect that sound has on mankind, there is a physical effect also.