We hear of four new histories of the war with Mexico, one of which will be in three large volumes, by an accomplished officer who served under General Scott. * * * * * MR. HORACE MANN is engaged on a work illustrating his ideas of the character, condition, and proper sphere of woman. He does not quite agree with Abby Kelly. * * * * * The old charge that "Garth did not write his own Dispensary," has been revived with exquisite absurdity in the case of General Morris and the song of "Woodman, Spare that Tree!" We have not seen the original accusation which appeared in an obscure sheet in Boston, but we give place with pleasure to the letter of the poet. We can imagine nothing less "apt and of great credit," as Iago defines the requisites of a judicious calumny, than this figment. The characteristics of Morris's style are exceedingly marked, and are altogether different from those of Woodworth, who was an excellent songwriter and a most worthy man, but was as little like Morris in his literary manner as two men can be who write in the same age and country. There are among our living poets few fairer and purer literary reputations than that of General Morris; few that, in a covetous mood, one would be more disposed to envy. It lives not in the tumult of reckless criticism and the noisy dogmatism of friendly reviews, but in the sympathy and enjoyment of thousands of refined and feeling hearts. His calm, delicate, and simple genius has won its way quietly to an apprecient admiration that no assaults can disturb, and it may now look down upon most of its contemporaries without jealousy and without fear. It will shine in its clear brightness when many clamorous notorieties of the day are quenched in night and silence. The charge of the Boston editor is a mere buffoonery. He could not expect that so ridiculous a fabrication would be believed by any body. It is a device of common-place, stupid malice, designed only to annoy a very amiable man. Had we been of counsel with the poet we should have advised him to take no notice of the foolish slander; but as he has seen fit to write a very interesting note on the subject, we are happy to preserve it here. The gentleman to whom the note is addressed gives the following account of the circumstances: "Some two or three months ago, the editor of the Boston Sunday News, took General Morris's literary character to task, and charged him with having obtained the famous song of 'Woodman Spare that Tree,' from the late Samuel Woodworth. In a word, he charged that the General was not the author of a celebrated poem, which has long been before the world in his name.