IIElevate the Stage.,The elevation of the stage goes briskly on. Young Mr. Knabenshue, the air-Hhip inventor, announces that he is about to accept a theatrical engagement; that he will make his stage entrance In a small air ship, and that when once anchored he will deliver a monologue w'hich will be suitably prepared for the occasion. To elevate the stage we must first elevate the actors, and there is no surer way of elevating actors than by sending them up in j air ships, providing In advance thatthose who are not acceptable shall not 'come down. Mr. Knabenshue explains that he has already contracted with the syndicate, to which we are indebted for so many brilliant histrionic acquisitions, and we have no doubt that his engagement in Chicago will be one of the leading features of the coming theatrical season. It is presumed, of course, that his appearance will be attended by the customary voiceless Donv ballet.