Limiting possibility to actual or future occurrences eliminates the explanatory distinction between latent causal powers and their manifestations, which is required for any adequate natural science.

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Explanatory distinction(as used in epistemology and logic): A clear, meaningful difference between two things that helps us understand why they work differently or matter in different ways.
Latent causal powers(in philosophy of science): Hidden abilities or potential forces that something has to create change or effects, even when those effects aren't currently happening.
Natural science(Contrasted with history as the science of mind): The explanatory practice whose explanandum is matter/nature.
manifestation(Domain of speech; contrasted with denotation and signification): The relation of a proposition to the subject who utters it; the expression of the 'I' as origin of speech.
possibility(Ortega's philosophical framework; refers to the range of options confronting the individual within his or her environment)

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