At night, when the moon is good enough to shine, the voyage up the river has charms, and tempts one to remain on deck all night, in spite of the sharp breezes which sweep across the stream. The harmonious accents of the gentle Servian tongue echo all round you: the song of the peasants grouped together, lying in a heap like cattle to keep warm, comes occasionally to your ears; and if there be anything disagreeable, it is the loud voices and brawling manners of some Austrian troopers on transfer. From time to time the boat slows her speed as she passes through lines or streets of floating mills anchored securely in the river. Each mill--a small house with sloping roof, and with so few windows that one wonders how the millers ever manage to see their grist--is built upon two boats. The musical hum of its great wheel is heard for a long distance, and warns one of the approach toward these pacific industries. The miller is usually on the lookout, and sometimes, when a large steamer is coming up, and he anticipates trouble from the "swell" which she may create, he may be seen madly gesticulating and dancing upon his narrow platform in a frenzy of anxiety for the fruits of his toil. A little village on a neck of land or beneath a grove shows where the wives and children of these millers live. The mills are a source of prosperity for thousands of humble folk, and of provocation to hurricanes of profanity on the part of the Austrian, Italian and Dalmatian captains who are compelled to pass them. Stealing through an aquatic town of this kind at midnight, with the millers all holding out their lanterns, with the steamer's bell ringing violently, and with rough voices crying out words of caution in at least four languages, produces a curious if not a comical effect on him who has the experience for the first time. [Illustration: FISHERMEN'S HUTS ON THE DANUBE.] Peaceable as the upper Danube shores look, Arcadian as seems the simplicity of their populations, the people are torn by contending passions, and are watched by the lynx-eyed authorities of two or three governments. The agents of the _Omladina_, the mysterious society which interests itself in the propagation of Pan-slavism, have numerous powerful stations in the Austrian towns, and do much to discontent the Slavic subjects of Francis Joseph with the rule of the Hapsburgs. There have also been instances of conspiracy against the Obrenovich dynasty, now in power in Servia, and these have frequently resulted in armed incursions from the Hungarian side of the stream to the other bank, where a warm reception was not long awaited. In the humblest hamlet there are brains hot with ambitious dreams daringly planning some scheme which is too audacious to be realized.