There have been presented the total blood cholesterol estimations, as measured in 100 cc. of whole blood, in 54 normal individuals and in 200 individuals not normal from a neuropsychiatric point of view.These two types of cases were considered as two distinct groups and the material evaluated accordingly.The evaluation of the results was carried out by means of a statistical procedure.The author wishes to acknowledge his appreciation of the assistance of Dr. George S. Johnson, Acting Director of the Colorado Psychopathic Hospital; Robert C. Challman, psychologist; and Miss Rachel D. Frame, in the preparation of the manuscript.Abstract Teaser