Berto hardly ever makes a mistake. When he does not understand the question, he waits for it to be written with the finger on his side; and the careful way in which he works it out like some backward and afflicted child is an infinitely pathetic sight. He is much more zealous and conscientious than his fellow-pupils; and we feel that, in the darkness wherein he dwells, this work is, next to his meals, the only spark of light and interest in his existence. He will certainly never rival Muhamed, for instance, who is the arithmetical prodigy, the Inaudi, of horses; but he is a valuable and living proof that the theory of unconscious and imperceptible signs, the only one which the German theorists have hitherto seriously considered, is now clearly untenable. I have not yet spoken of Zarif. He is not in the best of tempers; and besides, in arithmetic, he is only a less learned and more capricious Muhamed. He answers most of the questions at random, stubbornly raising his foot and declining to lower it, so as clearly to mark his disapproval; but he solves the last problem correctly when he is promised a panful of carrots and no more lessons for that morning. The groom enters to lead him away and makes some movement or other at which the horse starts, rears and shies. "That's his bad conscience," says Krall, gravely. And the expression assumes a singular meaning and importance in this hybrid atmosphere, steeped in an indefinable something from another world. But it is half-past one, the sacred German dinner-hour. The horses are taken back to their racks and the men separate, wishing one another the inevitable Mahlzeit. As he walks with me along the quays of the black and muddy Wupper, Krall says: "It is a pity that you did not see Zarif in one of his better moods. He is sometimes more startling than Muhamed and has given me two or three surprises that seem incredible. One morning, for instance, I came to the stable and was preparing to give him his lesson in arithmetic. He was no sooner in front of the spring-board than he began to stamp with his foot. I left him alone and was astounded to hear a whole sentence, an absolutely human sentence, come letter by letter from his hoof: 'Albert has beaten Hanschen,' was what he said to me that day. Another time, I wrote down from his dictation, 'Hanschen has bitten Kama.' Like a child seeing its father after an absence, he felt the need to inform me of the little doings of the stable; he provided me with the artless chronicle of a humble and uneventful life."