I Spontmeous and Experimental Diseases.- A. Multiple Sclerosis.- B. Subacute Sclerosing Panencephalitis.- C. Genetic Implications.- D. Animal Diseases.- II Restricted Heterogeneity (Oligoclonal Reaction).- A. Cerebrospinal Fluid Methodology.- B. IgG Restricted Heterogeneity.- C. Immunochemistry.- D. Viral Antigens.- E. Central Nervous System Antigens.- F. Nervous System Response.- Topic III Therapeutic Considerations.- Varia-Other Diseases.- Participants.