The difference between French and English art is as great as the difference between the Louvre and the National Gallery in Trafalgar Square; and about the same relative difference prevails with regard to us. At the last exhibition of the Louvre there were four thousand paintings offered; at the last exhibition of the National Academy there were about four hundred. This is not a very correct method of judging of the artistic excellence of a nation, but it is not far from correct in this case. H. F. A PICTURE BY MURILLO.--The time has yet to arrive when the march of empire _westward_ will bring in its train our portion of those chef d'oeuvres of painting and sculpture which adorn the princely palaces of Europe, and confer distinction upon the possessors of wealth and taste in humbler abodes. To us, who have never visited those miracles of art, the sight of one of them is too gratifying to be passed over without imparting a share of the pleasure to our less fortunate readers. For the first time in our lives, we have enjoyed the delight of seeing at the house of a friend one of the grand pictures of MURILLO, which was obtained by a distinguished connoisseur at Lima, in 1828, from the cloister of an old convent, where it had hung for countless years in ignoble seclusion. It had probably been brought from Spain during the life-time of the painter, as it is not described by any of his biographers, who have carefully enumerated the works of his pencil. This idea is strengthened by the fact of his having inscribed his name upon the picture, which is not to be found upon any of his master-pieces at Madrid and Seville. Although it has not escaped the injuries of time and ignorance, it appears to have had the rare good fortune never to have passed through the hands of a restorer or scourer: the whole effect of its magical colouring remains unobscured, except a few touches of the brush of some dauber, who has tried the experiment of adding freshness to the rose.