Three groups of 5 cases of pernicious anemia with signs of subacute combined degeneration of the spinal cord were treated with vitamin B12, folic acid and liver extract. Nine patients had not been submitted to other therapies; six patients had some treatment 7 to 48 months before (table 2) but were in hematoneurological relapse. The three drugs were administered twice a week, each treatment lasting for a month, so that 10 injections of each drug were made. In group 1 vitamin B12 was given in the total dosis of 100 y; in group 2 folic acid was administered in the total dosis of 500 mgm; group 3 received liver extract at the total dosis of 10 ml (150-200 USP anti-anemic unities). No associated treatment was instituted; the diet contained 70 to 80 gm of proteins by day. Red cell counts were made by usual methods; hemoglobin contents of the blood were determined by means of an alcaline solution of oxyhemoglobin, with spectrophotometric reading; the hematologic evolution (tables 3 and 4 and graphics 1, 2 and 3) was followed up by examinations made twice a week (in each case an average of 10 examinations was made). Neurologic evolution was studied by examination of the vibration sense every ten days and by complete neurologic examination before and after the treatment (tables 5 and 6). The results were submitted to statistical analysis. The homogeneity (Snedecor) of the initial values was proved. It was calculated the linear regression relating time and the average values of red cell count, hemoglobin content and pallesthesia of each group. The regression coefficients of the evolution of the red cell count and hemoglobin content proved to be statistically significant and were compared; the differences were also significant, showing the superiority of liver extract and folic acid over vitamin B12. The correlation between red cell count and hemoglobin content was positive. The regression coefficients of the evolution of pallesthesia were not significant, as well as the differences between the neurologic scores (table 6) before and after treat- ment in the three groups. However, neurologic results showed the superiority of vitamin B12 over folic acid and liver extract according to the values of the regression coefficients (table 5). No correlation between the evolutions of pallesthesia and of the red cell count was found. Disagreement between hematologic and neurologic results of the drugs was evidenced. Folic acid was less effective than vitamin B12 but it was slightly better than liver extract in relation to the neurologic evolution. Neurologic subjective symptoms improved in higher degree than objective signs. Vitamin B12 and folic acid evidenced better results in relation to the pyramidal syndrome; liver extract and vitamin B12 were more effective in the improvement of the peripheral syndrome; similar effects on dorsal funicular syndrome were evidenced by the three drugs (table 7). Among the neuropsychiatrie manifestations the most impressive results were observed on the psychical syndrome, muscular weakness, hypotonus and position sense disorders; signs of pyramidal release, depression of deep reflexes and particularly superficial sense disorders were the most resistant signs (table 8), irrespective of the kind of treatment.