A LETTER purporting to be by General WASHINGTON, and bearing date Cambridge, June 24, 1776, was read before the New-Jersey Historical Society a few weeks ago; the thanks of the Society were voted to Mr. Chetwood for it; and the _Literary World_ characterizes it as "interesting," "admirable," &c. The _Literary World_ does not, we believe, pretend to be an authority in such matters, but that a "historical society" should receive such a gross imposition is somewhat surprising. The letter is as much a forgery and imposture as the "exceedingly interesting letter from General Washington to his wife," published a few months ago in the _Day Book_. Without going into any further statement or argument on this subject, it may be sufficient to remark, that Washington was not within two hundred miles of Cambridge on the 24th of June, 1776. * * * * * THE REV. HENRY W. DUCACHET, D.D., the learned rector of St. Stephen's, in Philadelphia, has been several years engaged upon a Dictionary of the Church, which is now nearly ready for publication. Such a work is properly but a system and history of doctrine and ritual, in a form suited for the readiest consultation, and it demands, therefore, for its successful accomplishment, the highest and rarest faculties and acquisitions. Dr. Ducachet possesses in a very eminent degree, not only the requisite knowledge and judgment, but he has a certain temperament and felicity, with a love of and skill in dialectics, which promise even to the articles for a dictionary, from his hand, the utmost raciness and attractive interest. We understand this work will be very complete and voluminous. * * * * * The Poems of "Edith May," the finest artist among the literary women of this country, are to be published in a very beautiful edition next summer by E. H. Butler of Philadelphia. * * * * * THE AMERICAN PHILOSOPHICAL SOCIETY, which on account of some unfortunate investments of its capital, has for several years been compelled to suspend its publications, is now, we are gratified to be informed, again in a good financial condition, and new volumes of its important Transactions are in the press. * * * * * PROFESSOR HOWS, during the last month, has given a very interesting series of readings from Shakspeare, in which he has displayed not only the finest capacity for histrionic effect, but a critical sagacity, and a thorough knowledge of the greatest of the poets, which justify his own reputation. * * * * * MR. REDFIELD has in press "The Celestial Telegraph, or Secrets of the Life to Come, revealed through Magnetism, by M. Cahagnet," a book of the class of Mrs. Crowe's "Night Side of Nature;" and "The Volcano Diggings, a Tale of California Law, by a member of the Bar." * * * * *