2. The accidental causes which determine the direction of a tendency cannot be enumerated, because they vary for every individual case: we may note sex, social position, degree of culture, various maladies, etc. Tendencies to homicide and suicide are apt to spring up in a melancholic nature; alcoholism favours the incendiary impulse (pyromania); the epileptic and the general paralytic are more inclined to theft, and so on. Still more: the same impulse is variously modified, according to the soil in which it germinates; “the epileptic kills in a different way from the hypochondriac, the latter otherwise than the alcoholic or paralytic” (Schüle). This shows the part played by accidental and consequently unassignable causes, and is still better shown in the abrupt substitution of one irresistible tendency for another in the same individual. Ordinarily, each shows his own special peculiarity; one constantly repeats his attempts at suicide, another at theft. But in cases of deep-seated dissolution, the direction is uncertain. The author of the theory of degeneration gives an excellent example of this: a hypochondriac possessed in turn by irresistible impulses to suicide, homicide, sexual excesses, dipsomania, and pyromania, and who finally gave himself up to justice, saying that he was “happy, because his sufferings were about to end.”[143] We may say of all these overmastering impulses, _in radice conveniunt_; and thus the study of those which tend to destruction has led us, more than once, to speak of the other kinds. ----- Footnote 143: Morel, _Maladies mentales_, pp. 420 _et seq._ ----- CHAPTER IV. SYMPATHY AND THE TENDER EMOTIONS. _Sympathy is not an instinct, but a highly generalised psycho-physiological property—Complete sense and restricted sense—Physiological phase: imitation—Psychological phase: first stage, psychological unison; second stage, addition of tender emotion—Tender emotion—Its physiological expression—Its relations with touch—The smile—Tears: hypotheses as to their causes—Tender emotion indecomposable._ Sympathy is not an instinct or a tendency, _i.e._, a group of co-ordinated movements adapted to a particular end, and showing itself in consciousness as an emotion, such as fear, anger, sex-attraction; it is, on the contrary, a highly generalised psycho-physiological property. To the specialised character of each emotion, it opposes a character of almost unlimited plasticity. We have not to consider it under all its aspects, but as one of the most important manifestations of emotional life, as the basis of the tender emotions, and one of the foundations of social and moral existence. I.