ABSTRACT
How does the outside world make itself known to us through the miraculous system of detectors called sense organs? For thousands of years that question has caused men to speculate, but only in recent centuries have facts begun to replace fanciful surmise. Foremost among such facts is the so-called “specific energies” of the nerves: no matter how you stimulate a nerve, the sensation produced belongs to the modality normally served by that particular nerve.
