IX
Ce ne sont pas là tous les procédés des sciences, mais ceux-ci mènent aux autres. Vous allez voir comme chez Mill tout s’enchaîne. Il n’y a pas d’esprit plus rigoureux. Sans doute ces pro-
fore the causation is directly proved. We can, it is true, accomplish this only on a small scale ; but we have ample reason to conclude that the same operation, if conducted in Nature’s great laboratory, would equally produce the effect.
And, finally, even on that great scale we are able to verify the result. The case is one of those rare cases, as we have shown them to be, in which nature works the experiment for us in the same manner in which we ourselves perform it ; introducing into the previous state of things a single and perfectly definite new circumstance, and manifesting the effect so rapidly, that there is not time for any other ma-
