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Information about the topics discussed at the Third International Congress of Protozoology that was held in Leningrad, Russia on July 6 to 10, 1969 is presented. There were 641 registered participants from 36 countries. The Congress was sponsored by the International Commission on Protozoology. The International Society of Protozoologists cooperated.

Information about several topics discussed at the Symposium on Microbial Production in Freshwater held on May 27-31, 1969 in Leningrad, Russia is presented. Topics include the methodology for measuring microbial productivity in natural water. It discusses the groups of microorganisms that should be included in the measurement of microbial productivity.