A change into mania is not an indispensable feature of the symptomatology of melancholic depression. There are simple melancholias, some in single and some in recurring attacks, which never show this development. On the other hand there are melancholias in which the exciting cause clearly plays an aetiological part. They are those which occur after the loss of a loved object, whether by death or as a result of circumstances which have necessitated the withdrawal of the libido from the object. A psychogenic melancholia of this sort can end in mania, and this cycle can be repeated several times, just as easily as in a case which appears to be spontaneous. Thus the state of things is somewhat obscure, especially as only a few forms and cases of melancholia have been submitted to psycho-analytical investigation.[64] So far we only understand those cases in which the object is given up because it has shown itself unworthy of love. It is then set up again inside the ego, by means of identification, and severely condemned by the ego ideal. The reproaches and attacks directed towards the object come to light in the shape of melancholic self-reproaches.[65] A melancholia of this kind may also end in a change to mania; so that the possibility of this happening represents a feature which is independent of the other characteristics in the symptomatology. Nevertheless I see no difficulty in assigning to the factor of the periodical rebellion of the ego against the ego ideal a share in both kinds of melancholia, the psychogenic as well as the spontaneous. In the spontaneous kind it may be supposed that the ego ideal is inclined to display a peculiar strictness, which then results automatically in its temporary suspension. In the psychogenic kind the ego would be incited to rebellion by ill-treatment on the part of its ideal--an ill-treatment which it encounters when there has been identification with a rejected object. XII POSTSCRIPT In the course of the enquiry which has just been brought to a provisional end we came across a number of side-paths which we avoided pursuing in the first instance but in which there was much that offered us promises of insight. We propose now to take up a few of the points that have been left on one side in this way. A. The distinction between identification of the ego with an object and replacement of the ego ideal by an object finds an interesting illustration in the two great artificial groups which we began by studying, the army and the Christian church. It is obvious that a soldier takes his superior, that is, really, the leader of the army, as his ideal, while he identifies himself with his equals, and derives from this community of their egos the obligations for giving mutual help and for sharing possessions which comradeship implies. But he becomes ridiculous if he tries to identify himself with the general. The soldier in _Wallensteins Lager_ laughs at the sergeant for this very reason: