When the original object-love, at first directed to the parent, has been successfully transferred to some more remote relative in the manner studied in the last chapter, the course of normal development now requires that a further transference should take place by means of a similarity or association of some kind between this latter relative and some other person totally unconnected by family relationship. In consequence it is often possible to trace in the selection of the object of love the influence of similarity, or of some other connecting link, between this object and the lover's sister, brother, cousin or other relative. Here, however, the emancipation from the original object is carried too far for the underlying motive determining the direction of affection to be regarded as in any sense pathological or abnormal or as indicating an undue degree of fixation at an infantile stage of development; except in cases where this motive is so strong as to bring about the direction of love upon an object which is totally unsuitable, through the overlooking of defects which would otherwise be patent. Rather is this act of transference, when free from any such exaggeration, to be looked upon as the final stage of the whole process of development we have been following and as an indication of the attainment of maturity as regards the direction of the love impulse. [Sidenote: "Falling in love"] The importance of the displacement here at work will be more readily grasped, if we bear in mind that it constitutes one of the principal factors in the normal and all-important process of "falling in love," and particularly of that most striking but at the same time most mystifying aspect of that process which we call "love at first sight." Love and its causes have ever raised the wonder and curiosity both of the plain man and of the philosopher, but, apart from more or less unsatisfactory theory and vague speculation, neither has been able to bring forward any explanation of the sudden over-powering attraction which a young man or woman, boy or girl, may feel for some one member of the opposite sex; one whose charms may appear to more unbiassed eyes to be but little if at all superior to those of others of the loved one's age and situation. Thanks however to the work of the psycho-analytic school, psychology is at last beginning to cast a few rays of light upon the darkness which has hitherto surrounded this central problem of human life and feeling. Freud, in a recent article[116] summarizing the results of psycho-analysis in this direction, has divided loves into two main types:-- [Sidenote: Two types of love:--] (1) the narcissistic type, (2) the dependence type. [Sidenote: The narcissistic type]