Returning to Germany, Brahms appeared next at Mannheim, and, on December 12, conducted his D major Serenade and played Beethoven's E flat Concerto at the fifth Gürzenich subscription concert of the season at Cologne. He had but little success on this occasion either as pianist or composer. The serenade was criticised as being too lengthy and its themes as too 'naïve' for his elaborate treatment of them. A different reception was accorded him at a soirée of chamber music held at the conservatoire, when he performed with Hiller his Duet Variations, Op. 23, and with von Königslow and his colleagues the G minor Pianoforte Quartet. Both works were received with acclamation, and the composer achieved a success worthy of his position in the world of art. Before leaving Cologne Brahms played at a meeting of the Musikverein to a private audience of the members, most of them professors and students of the conservatoire. Amongst the pieces chosen by him for performance on this occasion were Bach's great Organ Prelude and Fugue in A minor. And now the anxious son found opportunity to hurry with beating heart to Hamburg to see his father and to make the acquaintance of his stepmother-elect. To find, also, every probability that Jakob had chosen wisely, and that his contemplated change of life bade fair to ensure a happy and peaceful close to a career that had been full of hardship and uncertainty. Frau Caroline Schnack, a handsome widow who had already been twice a wife, was just turned forty-one, and therefore more than seventeen years the junior of her proposed third husband. She had an only child, her son Fritz, born of her second marriage, now a lad of about thirteen. Capable and managing, she kept an excellent public dining-room for single men not far from the musicians' 'Börse,' described in an early chapter of our narrative, and had a regular _clientèle_ amongst the members of the Stadt Theater orchestra. Since the time when Johannes had thought it advisable for his parents to separate, Jakob had been one of her daily customers, and her good cooking and substantial capacity had gradually opened for her the way to his affection. Johannes, on his interview with Frau Schnack, was at once favourably impressed by her personality and gave his consent to the engagement, only insisting that full time for consideration on both sides should be allowed before the taking of the irrevocable step of marriage; and after a day or two in Hamburg he set out with a greatly relieved mind for Detmold, where he had arranged with Bargheer to spend the Christmas week and to reappear as composer and pianist on the scenes of his former activity.