ABSTRACT
The author's first lectures were concerned with rather special departments of classical physics on vibrations of elastic bodies, and electromagnetic waves. One of his pupils in first year of his academic career was Richard Becker, who was to become author's successor in the Gottingen chair of theoretical physics when he was driven out by the Nazis. The author's lecturing was abominable that happened a few years after his 'Habilitation'. He was asked by a group of chemists, medical men, pharmacists, etc., to give them a short private course on thermodynamics. One of them was Rudolf Ehrenberg, lecturer in physiology, who told him years later, when become his brother-in-law, that this lecture had been an ordeal for all of them; they did not understand a word but dared neither to interrupt him or nor to stay away as he was one of their colleagues and had volunteered for the job.
