PROF. CZESLAW BIALOBRZESKI, who was recently executed by the German authorities in Poland, came from a family of Polish country squires, settled in the Ukraine. He was born in 1879, when the Ukraine was a province of the Russian Empire. His earlier scientific and academic career was spent in the University of Kiev. Like other selected candidates for professorships he was sent abroad to continue his training. Langevin was the man to whom he chose to be attached. To Bialobrzeski, he was the embodiment of the ideal physicist, the man uniting philosophical clarity and vigorous theoretical penetration with fine understanding of experimental work. Biaiobrzeski was all his life a faithful admirer of Langevin, in spite of a fundamental difference of views in everything but physics.