THE sixth International Congress for Experimental Cytology will be held at Stockholm during July 25-August 1, 1940. A preliminary programme has been arranged by the Swedish organization committee (President, Prof. John Runnstrom; Secretary, Dr. Sven Horstadius; address: Wenner-Grens Institut, Norrtullsgatan 16, Stockholm). It has been developed from the point of view of cellular physiology. The conventional distinctions between physical chemistry, biochemistry and cellular physiology have at present no sharp borders. Therefore place has been reserved for physico-chemical discussions of the behaviour of the components of protoplasm. Opportunities will, however, be provided for the arrangement of informal afternoon sessions wherein smaller groups may enjoy unrestricted discussion. Membership fee for the Congress is 25 Swedish crowns.