the work of interpretation shows them up as, in reality, realization of sexual desires; whilst, on the other hand, that much of the thought-making when awake, the thoughts saved us as surplus from the day only, reaches presentation in dreams with the help of repressed erotic desires.

Towards the explanation of this statement, which is no theoretical postulate, it must be remembered that no other class of instincts has required so vast a suppression at the behest of civilization as the sexual, whilst their mastery by the highest psychical processes are in most persons soonest of all relinquished. Since we have learnt to understand infantile sexuality, often so vague in its expression, so invariably overlooked and misunderstood, we are justified in saying that nearly every civilized person has retained at some point or other