HARPER'S WEEKLY, New York, December 13, 1902  Frontpage photo Americans of To-Morrow, Jacques Loeb; The "Iowa Idea"; The World's Greatest Gun; Walter Damrosch as Lecturer, Composer, and Conductor; fullpage illustration "In Honor of Mark Twain's Sixty-Seventh Birthday"; doublepage centerfold illustration "The Opening of the United States Senate; Proposed Enlargement of the "Soo" Canal;  "In Honor of Mark Twain"; "A Toast to Mark Twain!"; Cross-Saddle Seats for Women with photos;  Automobiling; and other news and advertisements of the day. See photos for full details.