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Rh feelings. he bodily organs, and those other external things which make important contributions to this mode of our perception, together form the contemporary environment of the percipient organism. The main facts about presentational immediacy are: (i) that the sense-data involved depend on the percipient organism and its spatial relations to the perceived organisms; (ii) that the contemporary world is exhibited as extended and as a plenum of organisms; (iii) that presentational immediacy is an important factor in the experience of only a few high-grade organisms, and that for the others it is embryonic or entirely negligible.

Thus the disclosure of a contemporary world by presentational immediacy is bound up with the disclosure of the solidarity of actual things by reason of their participation in an impartial system of spatial extension. Beyond this, the knowledge provided by pure presentational immediacy is vivid, precise, and barren. It is also to a large extent controllable at will. I mean that one moment of experience can predetermine to a considerable extent, by inhibitions, or by intensifications, or by other modifications, the characteristics of the presentational immediacy in succeeding mo-