under the inflintee of the great pows so to take cognizance of the Prussisn spiracy. — A letter from an officer of the arm at Pernandina, Avelia Island, Get. 2, gentleman in Washington, has the fall postscript— * By the arrival of the iyi. instant, from Augustine, news had hive re ceived that a vessel from the Lavan arrived at that place, bringing the injua tion that 1400 troops were to sailfron latter to the former place in a fey day that the governor had put in close to meat the captain of the vessel, for ir publicity to the report? any Rey. British Consul. we are l ed for the following Circular. [ CIRCULAR TUMIS Magn :vari Foreign Office, Aug. 13, 1 Sly, Sin-fis Royal Highness the Pring Regent has been pleased by tis Qa in Council of the 28th day of May g hereinducl used, to sanction ceptury om diftentions of the laws which voggiay the colonial trade of Great Britain, far as they affect the Island of Mau sius, It is therein provided that from my date of that Order, British vessels ar riving at the Mauritiog from a can auity with His Majesty, and lady with the produce of such country, sha ve admitted into the ports of that colony and be allowed to dispose of their ca noes, and to export to any such coin the produce of the Mauritius, or my chandize which may have been royaly imported into the said colony of Mau tus 3 and it is further provided that i sels belonging to the subjects of gy state which may allow British vow to trade in the manner described, shy be permitted to trade in like manner tween the Mauritius and the ports such state. I have already communicated that or der to the Ministers of Foreign Pow resident at this Court ; but as a col derable time may elapse before His Roy al Highness’s Government can recey information of the measures which F reign Governments may link prop to adopt, with reference to the said o ser, it has become necessary to fi some arrangements by which the G overnor of the Mauritius shall be dled to give effect to His Royal lig ness’s Comands. That officer hs accordingly been instructed not tow ait any foreign vessel into the ports the Mauritius, unless she be provid with a certificate from His Majesty’ Corsi resident at the Port where m ay have taken out her clearance, st ting that regulations, corresponding the Prince Regent's order of the 2s of May, had been provulyated by Government of the Country where a Consul may be residing. I have therefore, to confey to you 1 Prince Regent's commands, that you dug vern yourself in confornity with Ce in tng tions which His Royal blighness be commanded to be conveyed to the Gover of the Mauritius, and that you will take proper steps to make this arrangement hiv to the authorities of the place in which I jare resident. Sam, Sir, your most obedient, humble x” ¥ant, CASTLEREAGH. James Buchanan, Esq His Majesty's Consul, New-York. To the politeness of James ty, Al,