A twofold development tends to take place at this age—in those youths, that is to say, who possess the latent attitude for psychic development—and that in two diverse directions, both equally away from definite physical desire, which at this age is sometimes, though not always, at its least prominent place in consciousness. On the one hand there is an attraction for an idealised person—perhaps a rather remote person, for such most easily lend themselves to idealisation—of the opposite (or occasionally the same) sex, it may sometimes for a time even be the heroine of a novel. Such an ideal attraction acts as an imaginative and emotional ferment. The imagination is stimulated to construct for the first time, from such material as it has come across, or can derive from within, the coherent picture of a desirable person. The emotions are trained and disciplined to play around the figure thus constructed with a new impersonal and unselfish, even self-sacrificing, devotion. But this process is not enough to use up all the energies of the developing mind, and the less so as such impulses are unlikely by their very nature to receive any considerable degree of gratification, for they are of a nature to which no adequate response is possible. Thus it happens in adolescence that this new stream of psychic energy, emotional and intellectual, generated from within, concurrently with its primary personal function of moulding the object of love, streams over into another larger and more impersonal channel. It is, indeed, lifted on to a higher plane and transformed, to exercise a fresh function by initiating new objects of ideal desire. The radiant images of religion and of art as well as of science—however true it may be that they have also other adjuvant sources—thus begin to emerge from the depths beneath consciousness. They tend to absorb and to embody the new energy, while its primary personal object may sink into the background, or at this age even fail to be conscious at all. This process—the process in which all abstract thinking is born as well as all artistic creation—must to some slight extent take place in every person whose mental activity is not entirely confined to the immediate objects of sense. But in persons of more complex psychic organisation it is a process of fundamental importance. In those of the highest complex organisation, indeed, it becomes what we term genius. In the most magnificent achievements of poetry and philosophy, of art and of science, it is no longer forbidden to see the ultimate root in this adolescent development.