The author noticed a variety of facts which were in direct opposition to the common notions entertained on the subject; and which led to the conclusion, that the chief object to be kept in view, was to destroy all sound that did not go directly from the source of sound to the ears of the audience, by preventing reflection. He described the plan of the Hall now building at the Assembly Rooms, the form of which is crucial, owing to the space on which it stands having been limited, and the necessity for connecting it with the pre-existing apartments; and he stated that he would have preferred a square, with the orchestra somewhat retired on one side.