PROF. ØJVIND WINGE has a record of extraordinary versatility and success in genetics and cyto-genetics. In his early work with the fish Lebistes reticulatus he established the partial sex-linkage of a large group of genes determining the male polymorphism of the species. This was the first demonstration of the genetic activity of the pairing segment of the sex chromosome. Later he established genetic sex-determination in plants, and elucidated the nature of polyploidy. One remarkable success based on keen observation and appropriate experimentation was to demonstrate the balanced lethal situation established in the 'ever-sporting Stocks'. He has contributed much to the clarification of linkage groups in Pisum, and his recent work proving sexual reproduction in the yeasts is of fundamental importance for the genetics of micro-organisms.