An attempt to assassinate the Queen of Spain was made by a priest named Martin Marino, on the 2d of February. The Queen was proceeding along the principal gallery of her palace toward the grand staircase, intending to go out upon a fête occasion, for which splendid preparations had been made, when she was approached by the priest, who kneeled to present a memorial. Her Majesty reached out her hand to take it, when he suddenly drew a dirk and made a stab at her side. Her arm, however, partially averted the blow, though she was severely wounded. She leaned against the wall, and one of her aids came up just in time to prevent a second blow. The assassin was arrested and confessed the crime--saying that his object was to render a service to humanity; and denying that he had any accomplices. He was tried on the 3d, and sentenced to death by strangulation. On the 7th, he was executed by the _garote vil_. He conducted himself with the most brutal indifference, refusing any of the usual offices of religion, and abusing all who came near him. The Queen suffered considerably from the wound, but was convalescent at the last accounts. Several arrests had been made, of persons suspected of having been concerned as accomplices with him, but no evidence was found to implicate any. CENTRAL AND EASTERN EUROPE. No events of special importance have occurred in any of the continental nations. All the governments seem to be more or less agitated by rumors of differences with England and France, and their policy is somewhat affected by them. The suspicion of hostile intentions on the part of Louis Napoleon toward Belgium has enlisted a good deal of suspicion, and letters from Brussels, dated the 19th February, state positively that a convention had been entered into, by which Russia agrees to furnish 100,000 men for the defense of that territory in case it should be invaded or seriously menaced by France. Prussia has also promised similar assistance, and the Prince de Ligne is said to be now in Berlin for the purpose of arranging the details. These important statements, however, do not seem to be made on authority sufficient to command full credit. In AUSTRIA, it is said, that Prince Schwartzenberg is preparing a general statement of the views of Austria concerning the state of Europe, and an indication of the line of policy which she will pursue. The mediation of Austria between Sardinia and the Pope has also been proposed, and amicable relations are again to be established between the Sardinian and Austrian governments. A new treaty has been concluded, by which Austria is to supply Russia annually with large quantities of salt.