The conditions of experience › What causality adds to succession

The Second Analogy of Experience brings the general project to a concrete problem. Looking at a house, you can inspect its roof and then its foundation, or reverse that order. Your successive perceptions do not mean that the roof and foundation themselves occur successively. By contrast, watching a ship move downstream involves apprehending a determinate order of positions in that event. Kant uses this contrast to ask what distinguishes subjective succession in apprehension from objective succession in what happens. Analytic of Principles, Second Analogy.

His answer requires a rule determining the event's temporal order. An objective alteration must stand in a connection through which a preceding state determines the following one according to a rule. Causality therefore functions as a condition for experiencing an objective event, rather than merely as an expectation produced by repeated association. This is Kant's argument for the causal principle; the house and ship are examples within it, not experimental evidence that establishes every step without further reasoning.

The claim has a strict limit. It does not derive particular laws or tell us which particular cause produced an event. Kant says explicitly in the Deduction's closing discussion that particular laws concerning empirically determined appearances require experience in addition to pure principles. Consequently, his defense of causal order is not a guarantee that tomorrow's bread will nourish or that an observed regularity will always persist. Those more specific expectations still require empirical inquiry. Deduction, closing discussion.