"A sound in the first place is an undulation in the air, and every musical sound has a number of overtones which it sets in motion as well. Four or five or more overtones are detected and recognized in music, but the oscillations extend a great deal further than the ear can follow. Corresponding waves are set up in higher and finer matter altogether, and therefore the chanting of a note or a series of notes produces effects upon the higher vehicles. p. 144"