In recent times it has been maintained that pleasure, as well as grief, ought to be regarded as a _sensation_, not as the concomitant of various psychic states; that both are fundamental senses having their own proper nervous energies distinct from other sensations. In other words, the expression, “sensations of pleasure and pain,” ought to be taken in the strict sense borne by the word sensation. I have already touched on this point in treating of pain, but it may not be out of place to return to it here; for, apart from its hypothetical character, I cannot think this assertion a happy one. In fact, if there is any psychological state clearly delimited and differentiated from all others, it is sensation. Sensation is determined and circumscribed by a special organ serving for this purpose only, as in the case of sight, hearing, etc., or at least by special nerves and special peripheral terminations, as in the case of touch, and temperature. Internal sensations, in spite of the nervous apparatus proper to them, have a vaguer character; hence some psychologists call them indifferently sensations or feelings. The kinæsthetic sensations, or those of movement, long included under the designation of muscular sense (an improper term, gradually falling out of use), have, though diffused through the organism, nerves peculiar to themselves; those of the muscular tissue, the articulations (the periosteum, the ligaments, the synovial membranes, the tendons). But pleasure and pain have neither special nerves nor special organs. We have seen the opinion admitted with regard to the pain-bringing nerves; as for the nerves of pleasure, I know no author who has hazarded such a hypothesis, however tentatively. It is true that one of those who admit the existence of nerves of pain (Frey) gets out of the difficulty very easily by saying that pleasure, consisting only in the absence of pain, requires no special nerves. May we not say, then, that it is a complete falsification of the meaning of words to class among sensations psychical phenomena answering to none of the required anatomical or physiological conditions?[33] ----- Footnote 33: