The work upon which Mark Twain and Mr. Charles Dudley Warner have been engaged for the past year is likely to prove the chief literary event of the season. Its first mention in The Tribune has excited great attention and interest, and we are able now to announce its name. It is called “The Gilded Age”—a name which gives the best promise of the wealth of satire and observation which it is easy to expect from two such authors. It is an unusual and a courageous enterprise for two gentlemen who have already won honorable distinction in other walks of literature, to venture upon untrodden paths with a work so ambitious and so important as this is likely to be. In one sense there is nothing to fear. An immense audience is already assured beforehand; and it is fair to conclude that writers who have displayed so much wit, insight, and delicate and fanciful observation, in former works, will not be unprovided with the equipment which is necessary to successful fiction. The new novel will be eagerly looked for and enormously read, and we hazard little in predicting that it will contain as much food for thought as for laughter.