WE have received a very indignant epistle from '_The Mail-Robber_,' who read our last number at Saratoga, where he is temporarily sojourning. We shall present it to our readers, with another poetical epistle, in our September issue. 'Mohawk, a Cluster of Sonnets,' by our friend H. W. ROCKWELL, Esq.; 'Green places of the City,' by Mrs. HEWITT; and 'Thoughts at Niagara,' are in type for our next. A word here to a few correspondents whose articles were not named in the large list enumerated in our last, or who have not been privately advised of the reception and disposition of their papers: Where is our venerable friend to whom we have been indebted for '_The Young Englishman?_' We look for him in our next. The 'Treatise of Books' by 'R.' struck us as rather stiltish and labored in its style, although its _thoughts_ were unexceptionable. It was declined, however, because our port-folios contained three or four papers on the same theme, for whose insertion at some future day we have been looking for several months. The 'Treatise' awaits 'R's order at the publication-office. 'H. W. R.'s indignation at the silly charge of plagiarism of '_The Southern Pinewoods_' by BRYANT--whose lines on '_The Prairies_,' written for the KNICKERBOCKER, furnished every thought and simile for the imitation--would be thrown away upon a 'weak invention.' The whole affair is a stupid joke, not worth a resurrection. 'Chronicles of the Past,' by an esteemed friend and contributor, is filed for insertion. 'Peter Brown and Dolly Cross,' a Legendary Ballad, and 'Night and Morning,' by 'W. H. H.,' bide their time. They are 'booked.' 'T.'s 'Lines on the Death of a Young Girl' are under 'hopeful' advisement. We shall be glad to receive the 'Inquiry concerning the Manifestation of Mind by the Lower Orders of Animals.' The theme is a fruitful one. Notices in type, of several new publications, are _unavoidably_ omitted. LITERARY RECORD.