The only privilege a student had that was worth his claiming, was that of talking to the professor, and the professor was bound to encourage it. His only difficulty on that side was to get them to talk at all. He had to devise schemes to find what they were thinking about, and induce them to risk criticism from their fellows. Any large body of students stifles the student. No man can instruct more than half-a-dozen students at once. The whole problem of education is one of its cost in money.