From the streets he enters the work-places, and interprets the wild poetry of roaring machines in smoky manufactories. The masterpiece of this group is that bold and powerful picture, his "Iron Mill" of 1876. The workshop of the great rail-forge of Königshütte in Upper Silesia is full of heat and steam. The muscular, brawny figures of men with glowing faces stand at the furnace holding the tongs in their swollen hands. Their vigorous gestures recall Daumier. Upon the upper part of their bodies, which is naked, the light casts white, blue, and dark red reflections, and over the lower part it flickers in reddish, greenish, and violet tinges, on the creases in their clothing. The smoke rising in spirals is of a whitish-red, and the beams supporting the roof are lit up with a sombre glow. Heat, sweat, movement, and the glare of fire are everywhere. Dust and dirt, strong, raw-boned iron-workers washing themselves, or exhausted with hard toil, snatching a hasty meal, a confusion of belting and machinery, no pretty anecdote but sober earnest, no story but pure painting--these were the great and decisive achievements of this picture. Courbet's "Stone-breakers" of 1851, Madox Brown's "Work" of 1852, and Menzel's "Iron Mill" are the standard works in the art of the nineteenth century. [Illustration: _Hanfstaengl._ MENZEL. THE DAMENSTIFTSKIRCHE AT MUNICH.] Within German art Menzel has won an _enclave_ for himself, a rock amid the sea. In France during the sixties he represented German art in general. France offered him celebrity, and after this recognition he had the fortune to be honoured in his native-land before he was overtaken by old age. His realism was permitted to him at a time when realistic aims were elsewhere reckoned altogether as æsthetic errors. This explains the remarkable fact that Menzel's toil of fifty years had scarcely any influence on the development of German painting; it would scarcely be different from what it is now if he had never existed. When he might have been an exemplar there was no one who dared to follow him. And later, when German art as a whole had entered upon naturalistic lines, the differences between him and the younger generation were more numerous than their points of sympathy, so that it was impossible for him to have a formative influence. He stood out in the new period merely as a power commanding respect, like a hero of ancient times. Even the isolated realistic onsets made in Berlin in the seventies are in no way to be connected with him. [Illustration: _Hanfstaengl._ MENZEL. KING WILHELM SETTING OUT TO JOIN THE ARMY.]