The British Resident announces to his countrymen that he has received from a person who styles himself "Charles, Baron de Thierry, Sovereign Chief of New Zealand and King of Nukuhiva," one of the Marquesas Islands, a formal declaration of his intention to establish in his own person an independent sovereignty in this country, which intention he states he has declared to their Majesties the Kings of Great Britain and France, and to the President of the United States; and that he is now waiting at Otaheite the arrival of an armed ship from Panama to enable him to proceed to the Bay of Islands with strength to maintain his assumed authority. His intention is founded on an alleged invitation given to him in England by Shunghee and other chiefs, none of whom, as individuals, had any right to the sovereignty of the country, and consequently possessed no authority to convey a right of sovereignty to another; also upon an alleged purchase, made for him in 1822 by Mr. Kendall, of three districts on the Hokianga River from three chiefs who had only a partial property in these districts, parts of which are now settled by British subjects by virtue of purchase from the rightful proprietors. The British Resident has also seen an elaborate exposition of his views which this person has addressed to the missionaries of the Church Missionary Society, in which he makes the most ample promises to all persons, whether whites or Natives, who will accept his invitation to live under his Government, and in which he offers a stipulated salary to each individual missionary in order to induce them, to act as his Magistrates. It is also supposed that he may have made similar communications to other persons or classes of His Majesty's subjects, who are hereby invited to make such communications, or any information on this subject they may possess, known to the British Resident or to the Additional British Resident at Hokianga. The British Resident has too much confidence in the loyalty and good sense of his countrymen to think it necessary to caution them against turning a favourable ear to such insidious promises. He firmly believes that the paternal protection of the British Government, which has never failed any of His Majesty's subjects, however remote, will not be withheld from them should it, be necessary to prevent their lives, liberties, or property from being subjected to the capriee of any adventurer who may choose to make this country, in which British subjects have now by the most lawful means acquired so large a stake, the theatre of his ambitious projects, nor, in the British Resident's opinion, will His Majesty, after having acknowledged the sovereignty of the chiefs of New Zealand in their collective capacity by the recognition of their flag, permit his humble and confiding allies to be deprived of their independence upon such pretensions. But, although the British Resident is of opinion that such an attempt as is now announced must ultimately fail, he nevertheless conceives that, if such a pcrsou we once allowed to obtain a footing in the country, he might acquire such an influence over the simple-minded Native as would produce effects which could not be too much deprecated or too anxiously provided against; and he has therefore considered it his duty to request the British settlers of all classes to use all the influence they possess with the Natives of every rank in order to counteract the efforts of any emissaries who may have arrived or may arrive amongst them, and to inspire both chiefs and people with a spirit of the most determined resistance to the landing of a person on their shores who comes with the avowed intention of usurping a sovereignty over them. The British Resident will take immediate steps for calling together the Native chiefs in order to inform them of this attempt upon their independence, and to advise them of what is due to themselves and their country, and of the protection which British subjects are entitled to at their hands; and he has no doubt that such a manifestation will be exhibited of the characteristic spirit, courage, and independence of the New Zealanders as will stop at the outset such an attempt upon their liberties, by demonstrating its utter hopelessness.