The following solution of the British armaments is supposed in a letter of the 25th ultimo, from Colonel Blachden of Connecticut, now at Dunkirk, to the Marquis de La Fayette. I will cite it in his own words:--"A gentleman who left London two days ago, and came to this place to-day, informs me that it is now generally supposed that Mr. Pitt's great secret, which has puzzled the whole nation so long, and to accomplish which design the whole force of the nation is armed, is to make a vigorous effort for the recovery of America. When I recollect the delay they have made in delivering the forts in America, and that little more than a year ago, one of the British ministry wrote to the King a letter, in which were these remarkable words, 'if your Majesty pleases, America may yet be yours;' add to this, if it were possible for the present ministry in England to effect such a matter, they would secure their places and their power for a long time, and should they fail in the end, they would be certain of holding them during the attempt, which it is in their power to prolong as much as they please, and, at all events, they would boast of having endeavored the recovery of what a former ministry had abandoned--it is possible." A similar surmise has come in a letter from a person in Rotterdam to one at this place. I am satisfied that the King of England believes the mass of our people to be tired of their independence, and desirous of returning under his government; and that the same opinion prevails in the ministry and nation. They have hired their newswriters to repeat this lie in their gazettes so long, that they have become the dupes of it themselves. But there is no occasion to recur to this, in order to account for their arming. A more rational purpose avowed, that purpose executed, and when executed, a solemn agreement to disarm, seem to leave no doubt that the re-establishment of the Stadtholder was their object. Yet it is possible, that having found that this court will not make war in this moment for any ally, new views may arise, and they may think the moment favorable for executing any purposes they may have, in our quarter. Add to this, that reason is of no aid in calculating their movements. We are, therefore, never safe till our magazines are filled with arms. The present season of truce or peace, should, in my opinion, be improved without a moment's respite, to effect this essential object, and no means be omitted, by which money may be obtained for the purpose. I say this, however, with due deference to the opinion of Congress, who are better judges of the necessity and practicability of the measure.