Section 3C) Third Analogy: Principle of Coexistence, in Accordance with the Law of Reciprocity or Community (p. 233)

Principle:

All substances, in so far as they can be perceived to coexist in space, are in thoroughgoing reciprocity.

Proof:

1. Things are coexistent when in empirical intuition the perceptions of them can follow upon one another reciprocally.
2. We cannot assume that because things are set in the same time that their perceptions can follow reciprocally. (Because time itself cannot be perceived.)
   • Influence: relation of substances in which one contains the ground of the determinations (accidents) of another.
   • Community or Reciprocity: relation of substances where each contains the ground of the determinations in the other.
3. We know two substances are in the same time when the order in the synthesis of apprehension of the manifold is a matter of indifference.
4. If each is completely isolated, (none receives reciprocal influences) coexistence would not be a possible perception.
   • Therefore, there must be something through which A determines for B and vice versa, its position in time.
5. Only that which is the cause of another determines the position of the other in time.

Comments:

• They thereby constitute a whole.
• There are three dynamical relations:
  • Inherence.
  • Consequence.
  • Composition: the appearances stand outside one another and yet in connection, constituting a composite.