(1) Organic soils in Sweden with special reference to organic clay and gyttja; (2) Special problems involved in sampling and testing of soils with organic matter; (3) Methods used in the present investigation; (4) Investigated soils and main test results; (5) Short presentation of soils in related investigations used as supplements; (6) Studies of the results of oedometer tests; (7) Studies of the results of shear strength tests