It is tolerably plain that the relation of feeling to cognition cannot be expressed by any single formula, and it is certainly far from true that sensation or other cognition is inversely as the intensity of feeling. If feeling, either as simple pleasure-pain or as interest, is the incentive of attention, which is the primary measure of cognition; then intensity of cognition is directly as intensity of feeling for a certain range, and this is also true where attention has lapsed. The law of inverse ratio applies only when feeling has risen beyond the point of highest efficiency, when there is over pressure, and mind runs wild beyond self-control and attention. Then we should, of course, find at a certain point, if we could make exact measurement, geometrical decrease in cognition for arithmetical increase in feeling, but ratio would constantly change. The centre and spring of any high psychic life is interest, and as interest increases intellection and volition increases _pari passu_. In cases of decline, where interest or capacity for emotion is lost, psychic life as a whole dissolves and disappears. On the contrary, the progress of mind is in the strengthening and extension of interest. Interest leads to attention in the forms mentioned, but it seems also a mode of attention when, at the bidding of interest, we not only promote or inhibit some cognition, but some particular feeling. In a fit of anger we may be prompted by prudence or conscience to forcibly and directly restrain and abate it. I may similarly maintain an amiable frame of mind as opposed to crossness. To repel a fit of anger of course implies repelling the representations which enter into the angry emotion, and so it is that the repressing or stimulating all emotions, by reason of their representative nature, necessitates a will effort with reference to the cognitive element, and thus an attention.