Editorial Advisory Board:

Polskie Archiwum Hydrobiologii existing as such since 1953, is a continuation of Archiwum Hydrobiologii i Rybactwa founded in 1926 under the editorship of A. L ity ń s k i; during the period 1926 to 1939 and in 1947, thirteen volumes of Archiwum Hydrobiologii i Rybactwa have appeared: volume XII, 3, 4, published in September 1939, being almost entirely destroyed due to was action. NOTICE TO AUTHORS Polskie Archiwum Hydrobiologii publishes papers in every fieid of hydrobiology. Only works not submitted elsewhere are accepted. L en g th. Succinctness of style is a prerequisite. In general, papers are limited to 16 printed pages, including illustrations, references etc. L an g u ag es. Papers are published in the official congress languages of Societes Internatio-nalis Limnologiae, i.e., English, French, German and Italian. Works submitted in Polish will be translated into English by the Editors. The Authors are required to quote English equivalents of all the special terms they employ, according to the usage current in English and/or American scien tific publications. A translation will be supplied to the Author for a verification. The final touch must be made at that phase. No amendments other than purely technical will be allowed i