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THREE:The next step was to create a method for determining the particular configuration on which any given property of matter depends. If such a problem could be solved at all, it would be by some new system of practical analysis. Bacon did not see this because he was a Schoolman, emancipated, indeed,377 from ecclesiastical authority, but retaining a blind faith in the power of logic. Aristotle��s Organon had been the great storehouse of aids to verbal disputation; it should now be turned into an instrument for the more successful prosecution of physical researches. What definitions were to the one, that Forms should be to the other; and both were to be determined by much the same process. Now Aristotle himself had emphatically declared that the concepts out of which propositions are constructed were discoverable by induction and by induction alone. With him, induction meant comparing a number of instances, and abstracting the one circumstance, if any, in which they agreed. When the object is to establish a proposition inductively, he has recourse to a method of elimination, and bids us search for instances which, differing in everything else, agree in the association of two particular marks.541 In the Topics he goes still further and supplies us with a variety of tests for ascertaining the relation between a given predicate and a given subject. Among these, Mill��s Methods of Difference, Residues, and Concomitant Variations are very clearly stated.542 But he does not call such modes of reasoning Induction. So far as he has any general name for them at all, it is Dialectic, that is, Syllogism of which the premises are not absolutely certain; and, as a matter of nomenclature, he seems to be right. There is, undoubtedly, a process by which we arrive at general conclusions from the comparison of particular instances; but this process in its purity is nothing more nor less than induction by simple enumeration. All other reasoning requires the aid of universal propositions, and is therefore, to that extent, deductive. The methods of elimination or, as they are now called, of experiment, involve at every step the assumption of378 general principles duly specified in the chapter of Mill��s Logic where they are analysed. And wherever we can rise immediately from, a single instance to a general law, it is because the examination of that single instance has been preceded by a chain of deductive reasoning.Sir John marched out of Edinburgh for the north on the very day that the standard of the Stuarts was erected in Glenfinnan, the 19th of August. On the following day he continued his route from Stirling, accompanied by one thousand five hundred foot, leaving, very properly, the dragoons behind him, as of no service in the mountains, nor capable of finding forage there. He then continued his march towards Fort Augustus, which he hoped to make the centre of his operations, and then to strike a sudden and annihilating blow on the handful of rebels. At Dalwhinnie he heard that the rebels now mustered six thousand, and that they meant to dispute the pass of Corriarrick, lying directly in the line of his march towards Fort Augustus. This Corriarrick had been made passable by one of General Wade's roads, constructed after the rebellion of 1715, to lay open the Highlands. The road wound up the mountain by seventeen zig-zags or traverses, and down the other side by others, called by the Highlanders the Devil's Staircase. Three hundred men were capable, much more three thousand, of stopping an army in such a situation, and Cope called a council of war. At length it was agreed that they should take a side route, and endeavour to reach Inverness and Fort George. The resolve was a fatal one, for it gave the appearance of a flight to the army, and left the road open to Stirling and the Lowlands.