other school calls it a category of thought. Also for them the mere data are the pure sense-data.
If either Hume or Kant gives a proper account of the status of causal efficacy, we should find that our conscious apprehension of causal efficacy should depend to some extent on the vividness of the thought or of the pure intuitive discrimination of sense-data at the moment in question. For an apprehension which is the product of thought should sink in importance when thought is in the background. Also, according to this Humian-Kantian account, the thought in question is thought about the immediate sense-data. Accordingly a certain vividness of sense-data in immediate presentation should be favourable to apprehension of causal efficacy. For according to these accounts, causal efficacy is nothing else than a way of thinking about sense-data, given in presentational immediacy. Thus the inhibition of thought and the vagueness of sense-data should be extremely unfavourable to the prominence of causal efficacy as an element in experience.
The logical difficulties attending the direct perception of causal efficacy have been shown to depend on the sheer assumption that time is merely the generic notion of pure succession. This is an
