For in order that the two sets of conditions might together bring about the phenomenon, as two components bring about a resultant, they would need an identical point of application or a common ground, and it is difficult to see what ground could be common to 'physiological facts' which are in space and 'psychic facts' which are nowhere: or even to objective processes like nervous inﬂuxes which belong to the realm of the in itself, and cogitations such as acceptance and refusal, awareness of the past, and emotion, which are of the order of the for itself.