I confine myself to the consideration of affective amnesia under its simplest and most widely-known form. Nothing is more frequently met with. In the first place, the single fact that most psychologists either neglect or deny the phenomenon of emotional memory, constitutes a presumption that its function is not a very obvious one. Moreover, that emotional memory which I have designated the false or abstract one, may, without prejudice, be considered as a mitigated form of forgetfulness. Finally, eliminating the non-emotional temperaments as irrelevant to our subject, we may find, even among the emotional, many who feel acutely, but do not retain their emotions. Every one knows people whose whole nature is shaken by sorrow, joy, love, indignation; they seem for a long time as if possessed; a few weeks later, not a trace remains. Emotions glide off their minds as a thunder-shower does off the roofs. Now this affective amnesia has a great influence on conduct. Here, in fact, are two general truths derived from experience, and in my opinion incontestable:— On the one hand, pleasant and painful sensations are the most powerful, if not the only motive forces of human activity. On the other, there are people in whom emotions are revived strongly, weakly, or not at all. The conclusion is that the portion of individual experience resulting from the pleasures and pains experienced, will show itself, as to its efficacy, strongly, feebly, or not at all, according to the individual. The prodigal who has ruined himself and is restored to opulence by an unexpected chance, if he has not preserved a lively recollection of his privations, will begin his extravagant career over again; if his painful recollections are of a stable character, they will act on his natural tendencies as a restraining or inhibitory force. The drunkard and the glutton will not repeat their excesses as long as the impression of the after-effects remains vivid. The educator, as every one knows, has no hold over a child on whom the recollection of rewards and punishments has no effect. I have already mentioned the state of mind which frequently succeeds dangerous confinements; this, again, is a case of affective amnesia. The absence of sympathy, in many men, is only an incapacity for reviving the recollection of the ills they have suffered themselves, and consequently for feeling them in others. These are well-known facts, of which it is needless to lengthen the list; but however well known they may be, their psychological reason is, in my opinion, not always apprehended, because the importance of the emotional memory has not been recognised. Affective amnesia, therefore, plays a much more important part in human life than we are apt to think. It often lets us into the secret of strange modes of action, though I would not assert that it _alone_ is sufficient to explain these everywhere and always. V.