Opening Remarks.- Opening Remarks.- Theoretical Part.- Destruction of Complement-Target Cell Complexes by Mononuclear Leukocytes.- Anticomplementary Activity of Guinea Pig Serum Euglobulin: Its Relation to C 1 and to TAMe Esterase.- Experimental Inhibition of Complement.- Molecular and Stereochemical Properties Required of Antigens for the Elicitation of Allergic Reactions.- Mammalian Erythrocyte Receptors: Their Nature and their Significance in Immunopathology.- Studies on the Structure and Formation of Antibodies.- Structure and Formation of Antibodies.- The Significance of the Carrier Effect for the Induction of Antibodies.- The Effect of Cytostatic Agents on Nucleic Acid and Protein Synthesis and on Immunological and Non-Immunological Inflammation.- Studies on the Cytotoxicity of Lymphocytes.- Contact Sensitivity and Immunological Tolerance as Competitors in Sensitization to Simple Chemical Compounds.- Results of Some Investigations on Lymphocyte Transformation in vitro.- In vitro Stimulation of Lymphoid Cells by Antilymphocytic Globulins.- The in vitro Transformation of Lymphocytes of Premature and Mature Infants.- Cell-Bound Antibodies to Streptococcal Cell-Wall Preparations.- Delayed Hypersensitivity and Tumor Specific Immunity.- Histological Changes in NZB/NZW Mice.- Clinical Part.- Clinical and Serological Aspects of the Aetiologic Differentiation of Auto-Immune Haemolytic Anaemias.- The Pathogenesis of Hemolytic Diseases of the ABO-System of the Newborn.- Immune Phenomena in Pernicious Anaemia.- Immune Reactions in Chronic Liver Diseases.- Cellular Immune Reactions in Experimental Hepatitis.- Quantitative Serum Immunoglobulin Determinations in Active Chronic Hepatitis and Idiopathic Cirrhosis.- The Possible Role of Lipid Containing RNA Viruses for the Etiology of Autoimmune Diseases.- Humoral Antibodies in Older Humans.- Experimental Glomerulonephritis in Unresponsive Rabbits after Termination of Immunologic Tolerance.- The Long Acting Thyroid Stimulator (LATS) in Thyrotoxicosis.- Immunological Investigations in Myasthenia Gravis and Other Skeletal Muscle Disorders.- Comparative Studies of the Immunopathology of Inflammatory Cardiovascular Diseases.- Possible Bithermic Pathomechanism in Cryoglobulinemic Vasculitis.- Amyloid Involvement and Monoclonal Immunoglobulins.- Research in Drug Allergy: A Search for Impurities?.- Immunogenicity of Semisynthetic Penicillins.