Charles A. Washburn, late United States minister to Paraguay, having resigned, and being desirous to return to the United States, the rear-admiral commanding the South Atlantic Squadron was early directed to send a ship of war to Asuncion, the capital of Paraguay, to receive Mr. Washburn and his family and remove them from a situation which was represented to be endangered by faction and foreign war. The Brazilian commander of the allied invading forces refused permission to the Wasp to pass through the blockading forces, and that vessel returned to its accustomed anchorage. Remonstrance having been made against this refusal, it was promptly overruled, and the Wasp therefore resumed her errand, received Mr. Washburn and his family, and conveyed them to a safe and convenient seaport. In the meantime an excited controversy had arisen between the President of Paraguay and the late United States minister, which, it is understood, grew out of his proceedings in giving asylum in the United States legation to alleged enemies of that Republic. The question of the right to give asylum is one always difficult and often productive of great embarrassment. In states well organized and established, foreign powers refuse either to concede or exercise that right, except as to persons actually belonging to the diplomatic service. On the other hand, all such powers insist upon exercising the right of asylum in states where the law of nations is not fully acknowledged, respected, and obeyed. The President of Paraguay is understood to have opposed to Mr. Washburn's proceedings the injurious and very improbable charge of personal complicity in insurrection and treason. The correspondence, however, has not yet reached the United States. Mr. Washburn, in connection with this controversy, represents that two United States citizens attached to the legation were arbitrarily seized at his side, when leaving the capital of Paraguay, committed to prison, and there subjected to torture for the purpose of procuring confessions of their own criminality and testimony to support the President's allegation against the United States minister. Mr. McMahon, the newly appointed minister to Paraguay, having reached the La Plata, has been instructed to proceed without delay to Asuncion, there to investigate the whole subject. The rear-admiral commanding the United States South Atlantic Squadron has been directed to attend the new minister with a proper naval force to sustain such just demands as the occasion may require, and to vindicate the rights of the United States citizens referred to and of any others who may be exposed to danger in the theater of war. With these exceptions, friendly relations have been maintained between the United States and Brazil and Paraguay.