WASHINGTON, May 7th.--The new American play by Mark Twain and Bret Harte entitled Ah Sin was produced to-night for the first time at Ford's National Theatre. Parsloe in the leading character evoked great laughter and applause from a densely crowded audience. At the conclusion on the play Mr. Parsloe was called before the curtain accompanied by Mr. Varney, who read the following telegram from Mark Twain:

Mr. Varney accordingly put the question, and the immense audience unanimously voted the play a success.