text:  After having said that in all the several methods of induction the universality of the law of causation is assumed he continues:-- "But is this assumption warranted? Doubtless (it may be said) _most_ phenomena are connected as effects with some antecedent or cause--that is are never produced unless some assignable fact has preceded them; but the very circumstance that complicated processes of induction are sometimes necessary shows that cases exist in which this regular order of succession is not apparent to our first and simplest apprehension