of Physics at the local Polytechnic for four months. Soon after that, he moved to Zurich, where on 26 May 1913 he received a habilitation at the ETH (reviewers: Albert Einstein and Pierre Weiss) and in the next year – at the kantonal University (reviewers Max von Laue and Alfred Kleiner). Until the end of his stay in Zurich he lectured at both of these universities. He also worked for Carl Zeiss and Brown Boveri, but he consistently rejected any propositions of permanent and well-paid jobs in the industry. In 1915 his son, Karol Wolfke, was born and in 1918, the daughter, Lucyna was born. After the restoration of Poland's independence in 1918, Wolfke obtained a Polish passport. In 1920 he got a proposal to take the position of professor at the University of Warsaw and accepted the nomination, but due to the financial problems and the lack of a laboratory, he did not undertake this job. In 1921 he obtained a successive habilitation at the University of Zurich (reviewers: Edgar Meyer and Erwin Schrödinger). In 1922 Wolfke got a position of professor at the Warsaw University of Technology and returned to Poland. At the Warsaw University of Technology he led the Department of Physics on the Faculty of Electrotechnics. In 1924 he started the cooperation with the Institute of Low Temperatures in Leiden. In 1926 his second son, Stefan Wolfke, was born. In the early thirties, Wolfke started to organize the Low Temperatures Institute. In 1938 he took part in the organization of the flight of Polish stratospheric balloon called "Star of Poland". The first flight was unsuccessful and the second one was precluded by the World War II. After the beginning of the World War II Wolfke was arrested (10@th November 1939), sent to Pawiak where he spent a week in cell number 49. After the release Mieczysław Wolfke managed (with the agreement of the occupier) the Research Department of Technical Physics and then lectured at the Higher State Technical School created in polytechnic buildings. He also organized support for the conspiracy and participated in underground teaching. In May 1944, Mieczysław's daughter Lucyna Rassalska died. The events of 1944 separated Mieczysław from his family. Mieczysław went to Cracow, while his wife, son-in-law and grandson stayed in the Warsaw University of Technology until the end of the Warsaw Uprising. After the end of it they were resettled to Cracow.