We have received the following letter, with the poem that accompanies it, from a gentleman whose political opinions have hitherto differed from our own; but who appears to feel, as every man who loves his country must, that there can be but one sentiment entertained by Englishmen at the present moment. Were we at liberty, we should be happy to do justice to the author, and credit to ourselves, by mentioning his name. TO THE EDITOR OF THE “ANTI-JACOBIN”. SIR,—However men may have differed on the political or constitutional questions which have of late been brought into discussion—whatever opinions they may have held on the system or conduct of administration—there can surely be now but one sentiment as to the instant necessity of firm and strenuous union for the preservation of our very existence as a people; and if degrees of obligation could be admitted, where the utmost is required from all, it should seem that in this cause the opposers of administration stand doubly pledged; for with what face of consistency can men pretend to stickle for points of constitutional liberty at home, who will not be found amongst the foremost at their posts to defend their country from the yoke of foreign slavery? That there should be any set of men so infatuated as not to be convinced that the object of the enemy must be the utter destruction of these countries, after making the largest allowance for the effects of prejudice and passion, it is not easy to conceive. Such, however, we are told, there are. They believe, then, that after a long series of outrage, insult, and injury, in the height of their animosity and presumption, these moderate, mild, disinterested conquerors will invade us in arms, out of pure love and kindness, merely for our good, only to make us wiser, and better, and happier, and more prosperous than before! Future events lie hid in the volume of Fate, but the intentions of men may be known by almost infallible indications. Passion and interest, the two mighty motives of human action, determine the Government of France to attempt the abolition of the British Empire! and if, abandoned by God and our right arm, we should flinch in the conflict, that destruction will be operative to the full of their gigantic and monstrous imaginations!—Harbours filled up with the ruins of their towns and arsenals, the Thames rendered a vast morass, by burying the Imperial City in her bosom—but I will not proceed in the horrible picture.