The method of tattooing corneal scars hitherto employed has consisted in making numerous needle pricks in the scar and then rubbing into them a paste of India ink. It is necessary to repeat this process many times with sufficiently long intervals to allow the inflammatory reactions to subside. This method has given such unsatisfactory results that corneal tattooing is now seldom attempted, either for cosmetic or for optical purposes. Moreover, it is open to the objection that it exposes the eye to serious danger of infection, and when the iris is caught in the scar, even to the danger of sympathetic uveitis. Several years ago it occurred to me that a simpler, safe and generally more satisfactory method of darkening corneal scars would be to inject the pigment or coloring matter into the tissue by means of a hypodermic syringe. I therefore tried this method, but instead of making use