The steamship Europa, from Liverpool via Halifax, arrived at Boston last evening, and her mails will arrive in this City to-day. Some additional European intelligence is telegraphed from Boston. The town of Melazzo was attacked on the 20th of July by GARIBALDI, with the bayonet, and after a desperate struggle the Neapolitans were forced to retire to the citadel, with the loss of 580 men put hors de combat. GARIBALDI's losses were also very heavy, he himself being wounded in the foot. The statement that the whole of Sicily had been evacuated by the Neapolitans was premature.
A dispatch from New-Orleans announces an arrival at that port with later advices from Mexico. MIRAMON is stated to be still at Lagos, unable to make his escape through the lines of the beleaguering Liberals. A bearer of dispatches to the State and Navy Departments came passenger from Vera Cruz.
The New-Orleans Delta verifies the statement that Gen. WALKER left the island of Ruatan on June 21, but denies that the coast of Central America was his immediate destination. When he found that Ruatan was in possession of the British authorities, he very prudently determined to avoid becoming involved in any disturbance with the Government of Honduras or of England, and so set sail for another island in the vicinity, whence, the Delta intimates, it was his intention to go up the San Juan River. By this time, in all probability, he is in Nicaragua.
The Convention of the Pennsylvania Democrats, called for the purpose of deciding upon the question of a union of the two wings upon an Electoral Ticket, as recommended by the State Committee, assembled at Cresson yesterday. The attendance was quite large, not only of delegates but of outsiders, the Douglas element, however, evidently predominating. The Convention did not commence business until 3 o'clock in the afternoon, when an excited debate immediately sprung up, caused by the presentation of propositions and counter propositions, for and against union. A compromise was finally agreed upon which permits the Democratic Electors, if elected, to cast the vote of the State for the candidate having the highest number of votes.
The Prince of Wales on Wednesday evening embarked on board the Hero, lying off Pictou, for his voyage up the St. Lawrence River. At Pictou the same enthusiasm greeted him which has characterized the receptions everywhere. Even along the road from Truro to that place triumphal arches were erected, and the bridges were covered with evergreens. There were fireworks and illuminations at night, and bonfires on the top of the surrounding hills.
The Annual Convention of the American Normal School and the American Teachers' Association assembled at Buffalo on Tuesday, and a full report of the first and second days' proceedings, furnished by our special reporter, will be found in this morning's TIMES. The proceedings were quite interesting. The first day's meeting was strictly that of the Normal School, and the first subject of discussion was as to the true order of studies to be pursued. A paper was read by Hon. D.N. CAMP, of Connecticut, on the "Relation of Normal Schools to Popular Education," and reports were received upon the condition of the Normal Schools of the different States. On Wednesday an interesting paper was read by Prof. WICKEESHAM, of the State Normal School of Pennsylvania, in support of the proposition that Normal Schools are necessary to the establishment of a profession of teaching. RICHARD EDWARDS, Esq, of Missouri, was chosen President of the Association for the ensuing year.
The fifth day's session of the Scientific Congress of Newport was an interesting one, though apparently a not very profitable one in its results. One of the most practical papers read was one by Prof. HORSFORD, attributing the destruction of BERDAN's Mechanical Bakery at Boston to spontaneous combustion. It will be recollected that the conflagration was charged as an act of incendiarism on the part of the bakers, who opposed the introduction of machinery in their business. The Professor made experiments tending to establish the truth of his theory. The Coast Survey vessel, with the astronomical party who went to the Coast of Labrador to observe the total eclipse of the sun, arrived at Newport on the afternoon of Tuesday.
The Pike's Peak Express brings advices from Denver City to the 2d inst. An outrage had been committed upon the editor of the Rocky Mountain News, by three desperate characters to whom he had made himself obnoxious. They entered his office and forced him to accompany them to a certain hotel, threatening to shoot any one who should attempt a rescue. He succeeded in making his escape from them, however, and was pursued by them to his office, when they fired volleys from revolvers, which he returned, and wounded one of them. The citizens were by this time aroused, and succeeded in capturing the desperadoes after shooting one of them through the head. Rich gold discoveries are reported on the Platte River.
Our San Francisco correspondent gives an interesting resume of the proceedings attending the trial and acquittal of Judge TERRY, which places the whole affair in the clearest possible light. A more impudent and shameless perversion of justice was never permitted to disgrace the annals of jurisprudence.
The second game in the great match between the Excelsior and the Atlantic Base Ball Clubs of Brooklyn for the Championship, took place yesterday, and resulted in the success of the Atlantics by one run -- the game standing 15 to 14.
The Stock Market holds on its upward course, and is reported out of the control of the Brokers, and far above the most sanguine of their calculations as to the influence of the great crop of the West on Railway prices. New-York Central closed 88 3/8; Illinois Central, 85 3/4; and Erie, 29 1/4 cent. State Stocks and Railway Bonds active at advancing prices. Money in good employment at 5@6 cent. on temporary loan, and 6@7 cent. on prime discounts.
Flour was moderately active at irregular prices. Wheat was plenty and heavy. Corn was more sought after, and was steady. Provisions and Cotton attracted rather more attention. Groceries, Metals, Hops, Seeds, Hides and Ashes were quiet. Whisky, Resin, Spirits Turpentine and Tallow were in fair request. Other branches of trade presented no really new feature.