UNCLE TOM AT BARNUM'S— At the request of Mr. Barnum we have witnessed a second representation of the play of Uncle Tom at the Museum. We are happy to be able to say that it has been reformed in several important particulars, wherein we felt called upon to bestow our censure on a former occasion. As an entertaining performance merely it always presented large claims to attention and regard. Our former criticism did not consider it in this respect, but viewed it in especial reference to its fidelity to the original story and as inculcating the great moral lesson designed by the author of the story on which it is based. Failing in this important end, we felt that it had no claim to particular consideration in consequence of any minor excellencies it might display. The reforms which have now been introduced into the piece essentially alter its general character and especially the impression it makes upon the audience. It is thus relieved of the leading objections we felt compelled to make at the first representation we witnessed, except the letting Uncle Tom off in happiness at the end. The deformity of the argument to show that slave labor here is no worse off than slave labor in England is removed, and the auction scene is rendered in a much more suitable and impressive manner. In other respects also a successful effort has been made to make the play conform to the spirit of the original story. It affords us sincere pleasure to observe and to announce this improvement, since the change is an important one in its bearing upon the public mind, and is a just tribute to the dignity of impartial criticism. For so decisive a reform in the representation of this great popular drama we feel that Mr. Barnum in entitled to our cheerful acknowledgments and our frank approval. Now let him kill Uncle Tom and all will be right.