Not only the portraits on the walls, but also the shelves in the library were thinned out. The disappearance of certain books and brochures happened discretely, usually the day after the arrival of a new message from above. Rubashov made his sarcastic commentaries on it while dictating to Arlova, who received them in silence. Most of the works on foreign trade and currency disappeared from the shelves - their author, the People's Commissar for Finance, had just been arrested; also nearly all old Party Congress reports treating the same subject; most books and reference-books on the history and antecedents of the Revolution; most works by living authors on problems of birth control; the manuals on the structure of the People's Army; treatises on trade unionism and the right to strike in the People's State; practically every study of the problems of political constitution more than two years old, and, finally, even the volumes of the Encyclopedia published by the Academy - a new revised edition being promised shortly. New books arrived, too: the classics of social science appeared with new footnotes and commentaries, the old histories were replaced by new histories, the old memoirs of dead revolutionary leaders were replaced by new memoirs of the same defunct. Rubashov remarked jokingly to Arlova that the only thing left to be done was to publish a new and revised edition of the back numbers of all newspapers.