Determinating the total protein contents by the Meulemans method and using strips of celulose acetate "Cellogel" for electrophoresis the authors have studied the CSF of 19 patients between 10 and 54 years old. Total proteins was found between 10 and 28 mg%. The proteins were separated in six fractions with the following results: pré-albumin 4.3%; albumin 54.8%; a1-globulin 5.9%; a2, globulin 8.3%; b-globulins 15.57c and d-giobulins 11.2%.