"And these graver matters are comprised in science," Wehlau continued, with emphasis. "Unfortunately, I have of late--those chairs are not made to ride upon, Hans; such school-boy tricks are very unbecoming in a future doctor--I have of late had too little time to examine you thoroughly in your studies. The voluminous work which I have just completed has, as you know, absorbed all my attention. But now I am free, and we can make up for our delay." "Of course, papa," said Hans, who had taken the paternal admonition to heart, and had left the chair, but was now seated on the corner of a table, swinging his feet. Fortunately, the Professor, whose back was turned to him, did not see this, so the father continued to arrange some papers upon his study-table, and went on calmly: "Your student days are past, and I hope they have carried with them all your nonsense. I depend upon greater seriousness, now that we are to begin scientific study in earnest. Be diligent, Hans; you will be grateful to me one of these days when you succeed me as professor." "Of course, papa," the obedient son observed for the third time; but as at the moment his father turned and cast an irritated glance at him, he jumped lightly from the table. "Will you never have done with these school-boy pranks? Pray try to take example by Michael; you never see him conduct himself so." "No, indeed," Hans laughed merrily. "The Herr Lieutenant is the embodiment of military discipline at all times. Always in position, his coat buttoned up to the throat. Who would have thought it when he came to us first, a shy, awkward boy, staring about him at the world and mankind as at something monstrous? I had to take him under my wing perpetually." "I imagine he very soon outgrew any wing of yours," the Professor said, sarcastically. "More's the pity. The case is reversed now, and he orders me about. But confess, papa, that at first you despaired of making a human being of Michael." "As far as conventionalities are concerned, I certainly did. He had learned more, far more, than I had supposed. My brother had been an excellent teacher to him, and when he was once aroused, he applied himself with such unwearied diligence and interest that I often wondered at the strength of character shown in divesting himself of all his childish, dreamy ways." "Yes, Michael was always your favourite," Hans said, discontentedly. "You never put any force upon him, but agreed instantly to his desire to be a soldier, while I----"