My teaching began at last. When I entered the class-room and stepped upon the platform for the first time, I felt somewhat strange. While lecturing, I wondered if a fellow like me could keep up the profession of public instructor. The students were noisy. Once in a while, they would holler "Teacher!" "Teacher,"--it was "going some." I had been calling others "teacher" every day so far, in the school of physics, but in calling others "teacher" and being called one, there is a wide gap of difference. It made me feel as if some one was tickling my soles. I am not a sneakish fellow, nor a coward; only--it's a pity--I lack audacity.