DOCENDO DISCIMUS, 223 getting stronger and stronger. While it was far from his nature to put on any airs of command, or seek authority over his lads by looking big, Carl perceived that they respected him, and gradually felt his strength. A hundred little experiments in teaching or govern- ment, which he would once have shrunk from, he now felt free to undertake, As his confidence and skill in- ereased, he took the same lively and indescribable in- terest in managing his boys which a dexterous driver has in controlling and guiding spirited horses, four or six in hand. Or, to use his own figure in hig journal, “the same pleasure which a sculptor feels, as the statue comes into shape and beauty under his chisel.” “WE LEARN BY TEACHING,” says a Latin proverb.* Carl met with this remark in an old writer: “I seem to myself to have no accurate knowledge of a subject until I have tried to teach somebody else.” There is nothing which gives such exactness of knowledge as endeavouring to communicate it. “It is,” said Mr. Mill, “a benignant provision of our adorable Creator, who thus, as it were, puts a bounty upon what might otherwise be a task and a drudgery.” This was exemplified in the lessons which Carl gave in his own language. If there was one thing which he thought he _ knew above all things else, it was German; yet, when. he came to teach a class of the higher boys, he found that they put questions to him which he could not an- * Docendo discimus.