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What exists for thought, we are told, is at most the results that we illusorily ascribe to such activities, strung along the surfaces of space and time by regeln der verknüpfung, laws of nature which state only coexistences and successions. Thought deals thus solely with surfaces.

This, however, though the most common, is not the only meaning which propositions are ever intended to convey. In the first place, sequences and coexistences are not only asserted respecting Phenomena; we make propositions also respecting those hidden causes of phenomena, which are named substances and attributes.

The only independent and unconditional coexistences which are sufficiently invariable to have any claim to the character of laws, are between different and mutually independent effects of the same cause; in other words, between different properties of the same natural agent. It is proper in this place to advert to a doctrine at least as old as Dr.

And in the above quotation Cuvier asserts that the necessary correlation which he considers so obvious in these cases, exists throughout the system: admitting, however, that in consequence of our limited knowledge of physiology we are unable in many cases to trace this necessary correlation, and are obliged to base our conclusions upon observed coexistences, of which we do not understand the reason, but which we find invariable.