Nor can you be sure, even after any particular
vibration has reached the surface of your body, that it will reach your mind unaltered and intact!
Etheric Vibrations as Causing Sensations
What goes on in the body itself is made clear by your knowledge of the cellular structure of man.
You know that you have a system of nerves centering in the brain and with countless ramifications throughout the structural tissues of the body.
You know that part of these nerves are sensory nerves and part of them are motor nerves. You know that the sensory nerves convey to the brain the impressions received from the outer world and that the motor nerves relay this information to the rest of the body coupled with commands for appropriate muscular action.
DIAGRAM SHOWING THE FOUR CHIEF ASSOCIATION CENTERS OF THE HUMAN BRAIN
The Road to Perception