'Although t' extract the naked truth, We put these traders on their oath; Yet while they swear to what they say, We find we're humm'd from day to day; Hence, when I write to you again, A second letter shall the first explain.' In Animal Magnetism parlance, we 'will' the reader from off our shoulder, and close the book. It is matter-full, however, and peradventure we may open it yet again, anon. MUSIC--MR. RUSSELL.--Our theatrical reporters have left us but brief space wherein to reply to a correspondent of the Philadelphia '_National Gazette_,' who, in a long communication bearing the signature of 'HONESTUS,' censures the tone of our remarks in relation to Mr. HENRY RUSSELL, the popular vocalist, and the peculiar style of his performances. Both the writer alluded to, and the editor who publishes and endorses his strictures, 'trust that the KNICKERBOCKER will not maintain a dignified silence' under their remarks, since, originating in a work supposed to be influential in leading public opinion, the observations complained of 'have inflicted deep injury on the profession of music, taking away incentive to honest professional toil, close study, and real science,' by elevating a false standard of musical excellence. The writer denies, in so many words, that Mr. RUSSELL ever received the honors in Italy, to which he lays claim; doubts his having been 'a pupil for three years under ROSSINI,' or that he studied under GENERALI, MAYERBEER, and other masters; affirms that 'The Brave Old Oak' is transposed, without acknowledgment, from LODER, save a few trifling alterations for the worse; that 'Some Love to Roam' does not bear the real composer's name; and that five-sixths of the 'Treatise on Singing,' recently issued, with Mr. RUSSELL's name as author, are plagiarized from a work on singing by Rodolph, who has been dead these thirty years.