Reduction of corneal metabolism leads to a local alkalosis and precipitation of Ca phosphate in Bowman''s membrane. Light rays appear to hasten the process. The calcified membrane prevents normal fluid exchange from epithelium to anterior chamber, and an amorphous eosinophil mass is deposited anterior to Bowman''s membrane. In a case of band-shaped corneal degeneration, illustrative of the above condition, a portion of the calcined Bowman''s membrane was split up into parallel platelets. This peculiarity may be based on a preformed physiologic structure. In a case of arterial hypertension, purple staining concretions were present in Bowman''s membrane and in the superficial scleral layers. The precipitation may be a general metabolic deterioration of the ocular walls.