I An Imaginary Hamlet—Dr. S. M. Landis,M. D., D. D.. of Philadelphia, plavod Hamlet at the Grand Opera-house last night, with an imagioary company. The audience, alio, was entirely imaginary. Aa we predicted yesterday, the doctor did not wear a white plug like the balance of the Philadelphia delegation. He ended the performance with iamous accusation scene with his mother. It is a pity he did not go on to the aceoe where Hamlet dies.