Seborrheic forms of blepharitis marginalis of long standing are not always easy to dispose of by the correction of errors of refraction and the application of ointment of yellow mercuric oxid. There are probably few present who have not been sadly disappointed in their expectations of a cure from this treatment. In many of these cases there is an underlying systemic cause which is often hard to find and, when found, harder to correct. Long years of uncorrected eye strain, bad hygiene and improperuse of food and drink have brought the patient to such a state that our ministrations can at best only partly restore the eye lids to a normal appearance. After the disease has become chronic, it resolves itself locally into a chronic infection of the follicles of the eyelashes. I am inclined to think that it is at first a nutritive disturbance and that the infection is