LOUIS VIARDOT has published in Paris a _Histoire des Arabes et des Mores d'Espagne_. The excellent translator of _Don Quixote_ ought to produce a striking work on this subject. The Count ALBERT DE CIRCOURT, too, has published a new edition of his _Histoire des Mores Mudejares et des Morisques; ou des Arabes d'Espagne sous la domination des Chretiens_. Few topics in history have been until recently so much neglected as that of the Moorish races in Europe, and a good deal of what has appeared on the subject has been put together rather with a view to romantic effect than with a proper respect for the responsibility of the historian; though all Spanish history, Christian or Saracen, so abounds in romantic interest that there is less excuse, as less necessity, for outstepping the limits of truth, or giving undue prominence to the pathetic and marvellous. From this defect of most of his predecessors, the work of the Count de Circourt is in a great measure free. He has made a dexterous and conscientious use of the materials within his reach, and produced a work which unites to an unusual degree popularity of style with matter of great novelty and interest. There are few spectacles in modern times more attractive, or hitherto more imperfectly understood, than the condition of the Spanish Moors, from the time when they became a subject race, until their final expulsion from Europe in 1610. The reason why more attention has not been given to this subject, must be looked for in the fact that the expelled people were Mahometans, and that they took refuge in Africa, not in Europe. They had not, as the Protestants of France had, an England, Holland, and Germany to sympathize with and shelter them;--though, taking it with all its consequences, the Revocation of the Edict of Nantes was not a more important event in history, or more pregnant with injury to the power that enforced it, than the expulsion of the Moors from Spain. In folly and perversity the last transaction has pre-eminence. Louis XIV. revoked the Edict of Nantes, when he and his empire were at the summit of their power; but Philip III. chose the luckless moment for expatriating the most energetic and industrious of the inhabitants of Spain, when the virtual acknowledgment of the independence of the Dutch, and the concession to them of free trade to India, now assailed the prestige of Spanish supremacy in Europe, and the commerce of Portugal, at that time subject to Spain. From that hour the Peninsula declined with unexampled rapidity; and though, in course of time, the progress of decay became less marked, it was not finally arrested until two centuries after, when the invasion of Napoleon re-awakened Spanish energies, and freed them from the trammels which had impeded their development. Two centuries of degradation are a heavy penalty for a nation to pay for pride and intolerance; though not heavier than Spanish perfidy and cruelty to the Moors most richly deserved.