Further to study the movements of the features will require an examination into the reasons for the action of these, and not other muscles, as accompaniments of the psychical states. Piderit holds it is due to the fact that the motor nerves which supply these muscles rise right next to the purely psychical centers and hence these muscles are the supports of the organs of sense. The latter is no doubt correct, but the first statement is rather doubtful. In any event it is evident that the features contain an exceptionally large number of fine muscles with especially rich motor capacity, and hence move together and in accordance with the psychical conditions. It may be that the other muscles of the body have also a share in this but that we fail to perceive the fact. Such movements, however, have not been essential.
We may take it as a general rule that all joyous and uplifting emotions (even astonishment) are succeeded by the raising of the skin of the forehead, the nostrils, the eyes, the eyelids, while sad and oppressing emotions have the contrary effect. This simple and easy rule renders immediately intelligible many an otherwise obscure expression which we find important but concerning the meaning of which we are in doubt. The development of a movement in any face goes, according to Harless,[123] in this fashion: “The superior motor nerve is the oculomotorius. The stimulation reaches this one first--the mildest alteration of emotion betrays itself most rapidly in the look, the movement and condition of the pupil of the eye. If the impulse is stronger it strikes the roots of the motor end of the trigeminus and the movement of the muscles of mastication occur; then the intensified affection spreads through the other features.” Nobody will, of course, assert that even a completely developed physiognomical science will help us over all our difficulties, but with a little attention it can help us to a considerable degree. This help we do need, as La Rochefoucauld points out, with even contemporary correctness, “It is easier to know men than to know a particular man.”
The physiognomy of the hand stands close to that of the face in significance and is in some relations of even greater importance, because the expression of the hand permits of no, or very slight, simulation. A hand may be rendered finer or coarser, may be rendered light or dark, the nails may be cared for or allowed to develop into claws. The appearance of the hand may be altered, but not its physiognomy or character. Whoever creases his face in the same way for a thousand times finally retains the creases and receives from them a determinate expression even if this does not reveal his inner state; but whoever does the same thing a thousand times with his hand does not thereby impress on it a means of identification. The frequent Tartuffian rolling of the eyes finally gives the face a pious or at least pietistic expression, but fold your hands in daily prayer for years and nobody would discover it from them. It seems, however, of little use to know that human hands can not be disguised, if they are little or not at all differentiated; but as it happens they are, next to the face, the most extremely and profoundly differentiated of human organs; and a general law teaches us that different effects are produced by different causes, and that from the former the latter may be inferred. If then we observe the infinite variety of the human hand we have to infer an equally infinite variety of influences, and inasmuch as we cannot trace these influences any further we must conclude that they are to be explained causally by the infinite variety of psychical states.