Nothing, indeed, has tended to deceive and mystify the public mind more than the arbitrary conjunction of names. The yoking together of men in this manner has produced often a lamentable confusion as to their respective intellects and characteristics. Sometimes a mediocrist and a man of genius are thus coupled together; and what is lost by the one is gained by the other, while the credit of the whole firm is essentially impaired. Sometimes men of equal, though most dissimilar intellect, are, in defiance of criticism, clashed into as awkward a pair as ever stood up together on the floor of a country dancing-school. Sometimes, for purposes of moral or critical condemnation, two of quite different degrees of criminality are tied neck and heels together, as in the dread undistinguishing "marriages of the Loire." Sometimes the conjunction of unequal names is owing to the artifice of friends, who, by perpetually naming one favorite author along with another of established fame, hope to convince the unwary public that they are on a level. Sometimes they are produced by the pride or ambition, or by the carelessness or caprice, of the men or authors themselves. Sometimes they are the deliberate result of a shallow, though pretentious criticism, which sees and specifies resemblances, where, in reality, there are none. Sometimes they spring from the purest accidents of common circumstances, common cause, or common abode, as if a crow and a thrush must be kindred because seated on one hedge. From these, and similar causes, have arisen such combinations as Dryden and Pope, Voltaire and Rousseau, Cromwell and Napoleon, Southey and Coleridge, Rogers and Campbell, Hunt and Hazlitt, Hall and Foster, Paine and Cobbett, Byron and Shelley, or Robespierre and Danton. In the first histories of the French Revolution, the names of Marat, Robespierre, and Danton occur continually together as a triumvirate of terror, and the impression is left that the three were of one order, each a curious compound of the maniac and the monster. They walk on, linked in chains, to common execution, although it were as fair to tie up John Ings, Judge Jeffreys, and Hercules Furens. A somewhat severer discrimination has of late unloosed Marat from the other two, and permitted Robespierre and Danton to walk in couples, simply for the purpose of pointing more strongly the contrast between the strait-laced demonism of the one, and the fierce and infuriated manhood of the other. At least, it is for this purpose that we have ranked their names together.