THE twenty-seventh Dutch Physical and Medical Congress will be held at Nijmegen during April 11-13, 1939, under the presidency of Dr. G. Hoist. General lectures will be given by Dr. G. Hoist on “The Properties of Magnetic Materials” and by Prof. B. Brouwer on “The Significance of the Hydro-dynamic Relations within the Skull Cavity and the Semicircular Canal for Neural Surgery” on April 11, and by Prof. L. S. Ornstein on “Physics and Biology” and by Prof. E. Gorter on “Very Thin Films” on April 12. The scientific work of the meeting will be dealt with in the four sections: Mathematical and Physical Sciences, Biological Sciences, Medical Sciences, Geological-Geographical Sciences, some seventy papers having been promised. A full programme of social functions, visits to factories, laboratories, hospitals and other places of interest has been arranged. Information can be obtained from the “Natuuren Geneeskundig Congresbureau”, Bureau Vreemdelingenverkeer, Keizer Karelplein 9, Nijmegen, Holland.