American diplomacy is pushing on into the Orient. A treaty has been negotiated with Persia, by Mr. Marsh, our ambassador at Constantinople, which guarantees to our commerce all the advantages enjoyed by the most favored nations. The overtures for this treaty came from the Shah himself, through his envoy at Constantinople, and were promptly met by Mr. Marsh, acting under the instructions of Secretary Clayton. It now remains to be seen whether our trade with the Persian kingdom will grow to much under the favorable influence of the new compact. Up to the present day Persia does not figure very largely in the annual returns of the treasury department.

The idea of renewing the search for Sir John Franklin, by American vessels, has been set on foot again by a letter of Commodore Wilkes, who advises the dispatching of ships to Wellington Channel, and explorations from there by sledges, especially in a westerly direction. Mr. Henry Grinnell has also addressed a memorial to Congress, supported by the petition of a large number of citizens of New-York, asking that the Government will again fit out and man his two vessels, the Advance and Rescue, which he offers for the purpose, and send them out, accompanied by a store ship and a propeller. The Maryland Institute, and a large number of the citizens of Baltimore, have also addressed a similar petition to Congress. It is certain that, what with the efforts of our own countrymen and those of the British government, the subject will not be abandoned till something positive has been ascertained with regard to the fate of Franklin and his companions.

Congress has continued in session, but has accomplished little or no useful legislation within the month. The time has been mainly occupied with debates on foreign intervention, on giving the job of printing the census to the publishers of the Union newspaper, and on the abolition of the law giving the delegate from Oregon only $2500 mileage. The census printing question occasioned a rencontre between Senator Borland, of Arkansas, and Mr. Kennedy, the Superintendent of the Census, in which Senator Borland got into a passion and knocked Mr. Kennedy down, breaking his nose, at the same time that he vehemently expressed a desire, to the bystanders who interfered to prevent further violence, to get at Mr. Kennedy in order that he might "cut the d——d rascal's throat." Mr. Stanly, of North Carolina, and Mr. Giddings, of Ohio, have had a passage of personalities in the House, which has been quite universally condemned by the press and public.

Kossuth has continued his career of triumph in the west, and besides the ovations of the people, has received a large amount of the material aid, which he especially seeks. Wherever he goes, he receives contributions of money and offerings of arms. A good deal of attention has been excited by a letter from Mr. Bartholomew Szemere, one of Kossuth's former friends, and even a minister in the Hungarian revolutionary cabinet, charging him with cowardice, weakness, and a fatally irresolute and vacillating policy in the administration of affairs. Szemere also denies that Kossuth has any just right to call himself the Governor of Hungary, or even the leader of the Hungarian people. On the other hand, Mr. Vukovitch, who was also a minister in the same cabinet, who is now in Paris, has published a letter on Kossuth's side. To Szemere's letter Mr. Pulszky has replied from Cincinnati, repelling the charge of cowardice against Kossuth, and showing that Szemere himself had fled from Hungary some months before the termination of the war, and when there was still reason to hope that it might be brought to a favorable issue; and Count Bethlen, another of Kossuth's suite, also states that Szemere is a man of exceeding vanity, an intriguer against every body that is above him, and that no man is more unpopular in Hungary than he. Therefore, it is argued, his opinion is valueless, and he is utterly in the wrong when he says that Kossuth is no longer beloved and accepted by the Hungarians as their chosen leader.

The revolutionary disturbances in Northern Mexico have been renewed, the government having unwisely returned to the old tariff of import duties, which was the pretext for the first outbreak. Accordingly, Caravajal has got his men together again and has resumed operations, of course with considerable assistance from the Texan side of the line. Mexico is generally in great trouble, not only from insurrections in this and other parts of the republic, but from the fact that the entire political organization is in a state of decay approaching dissolution. The revenue is insufficient for the ordinary wants of the government, which is unable to pay its civil officers or the army with the exception of the troops in the field, to whom something has had to be paid, though not all they have been entitled to. The deficit for the last year, exceeds a million of dollars, exclusive of the interest on the debt. Congress met on the first of January, when President Arista addressed the two Houses in a speech, exposing the dangers of their situation, and calling on them to come up to the sublime task of saving the country from the destruction which menaces it.

From South America we have the details of the progress of the revolution which begun in Chili in the last autumn, and is not yet finished. It commenced with a revolt of the provinces of Coquimbo and Concepcion, against Gen. Montt, the President, elected by a large majority in the other ten provinces of the republic. The election took place in June last, and the insurrection broke out on the 6th and 8th of September, under the leading of Gen. Cruz. The government forces were commanded by Gen. Bulnes, the retiring President, who put his antagonists to route in a battle at Longomilla. The contest was a most furious and bloody one; the armies on the two sides were nearly equal, eight thousand men being engaged in all. Two thousand, or one quarter of the whole, were left dead upon the field. After his defeat, Cruz signed an agreement recognizing Montt as the legitimate President, and promising to disband all his forces, and make no farther attempt to disturb the peace of the country, on condition that his offence and that of his associates should be pardoned. It was thought that this event would insure the tranquillity of the country for many years; and Bulnes was received at Valparaiso with great rejoicing on his return from the campaign. But the agreement of the insurgents was not kept. On the 30th of December they rose again, and got possession of the city of Copiapo, and prepared from there to resume their march against the capital. Should Bulnes again defeat them, as is probable, he will be sure to show them no mercy.

From the Rio de la Plata we have intelligence which seems to leave no doubt that Rosas, the tyrant of Buenos Ayres, is on the verge of destruction. Urquiza, the general who has just freed the republic of Uruguay from the presence of Rosas's satraps, and restored to the important city of Montevideo the enjoyment of its liberty and the advantages belonging to its commercial position, has now completed his preparations, and is about to march against the dictator himself. Besides the troops of Entre Rios, his own State, he has under his command the forces of Corrientes, and is aided by the Brazilian fleet and army, and some 2,000 men from Uruguay. The entire force about to move against Rosas cannot be less than 30,000 troops, including some of the best soldiers in South America, and a full complement of artillery. Rosas, on his part, by extraordinary efforts, has got together some 20,000 men, many of whom are raw recruits, and none of whom retain that faith in the invincibility of their leader which has been an important element in his previous successes. The supple legislature of Buenos Ayres has, in these circumstances, outdone itself, and has not only made him absolute and irresponsible dictator during the war, but for three years after the victory. That victory, however, we opine he will never see. As Urquiza approaches, the army of the dictator will diminish. Large bodies of his soldiers will go over to the enemy; and he will either be shot or allowed to escape to England, to live there upon the revenues of his enormous and ill-got fortune.

In England all the world has been agog for the approaching opening of Parliament, which was to take place on the 3d of February. The highest expectations of entertainment were cherished from the set-to then expected to take place between Lord John Russell and Lord Palmerston, the dismissed Foreign Secretary. It will be piquant to see these former allies converted into antagonists, and cutting and slashing at each other with all the greater effect from the intimate knowledge of each as to the concerns of the other. As a ready and efficient public debater Lord Palmerston is the superior of the two.

All possibility of trouble between the United States and England on account of the brig Express firing into the steamer Prometheus at San Juan de Niacaragua, has been prevented by a manly apology made by the new British Minister for Foreign Affairs, Lord Granville. The act is as creditable to his lordship, as it is grateful to all who would not have the friendly relations between the two countries disturbed.

It is authoritatively stated that the new reform bill, which will be brought forward shortly after the opening of Parliament, will not so much extend the suffrage as vary the present apportionment of representatives. The boroughs, which are notoriously small, are to be enlarged by copious annexations, but there will be no new boroughs, nor will the large towns, such as Manchester and Liverpool, get any more representatives than they have now. If this be the nature of the bill, it cannot give satisfaction to either the Radicals or the Tories, nor extricate the Cabinet from its present difficulties. The cabinet has been further weakened by the resignation of Lord de Broughton—better known as Sir John Cam Hobhouse—as President of the Board of Control for the affairs of India, and of Lord Normanby as Minister at Paris. It is surmised that Lord Normanby retires to take his chance for coming into power again as a member of a new cabinet, with his friend, Lord Palmerston, at its head—not an improbable thing, by the way. He is succeeded at Paris by Lord Cowley. The troubles at the Cape of Good Hope still continue, with no advantage gained on the British side. The Caffres seem even harder to beat than was our own Florida Indians. The Government is loudly blamed for not acting more promptly in despatching forces to that colony; and the opinion is expressed that the Duke of Wellington, the Commander-in-Chief of the Army, has, by great age, lost the energy of his powers and character. In his younger days, it is said, he would either have had the required reinforcements at once sent forward, or would have resigned his office. The Government and its agents have also been blamed for not more promptly despatching vessels to search for the passengers who got off in boats from the steamer Amazon, destroyed by fire off Scilly. It is possible that by timely action many lives might have been saved.