Abstract
I AM deeply grateful to the officers and members of the Chicago Ophthalmological Society for the honor of this lectureship and for the opportunity to pay tribute to Dr. Gifford's memory. I trust that I may be forgiven if I take a moment of the time of this scientific society to say a few personal words, for I loved Sandy very much. He was to me not merely an eminent and distinguished colleague but also a great person. I had somehow expected that he and I would grow old in ophthalmology together. Hardly a month passes but that some problem arises on which I wish I could have his judgment, some action in which I know I could have counted on his support. The subject which I have chosen is one in which he was deeply interested.1 The past ten years has witnessed a phenomenal increase in knowledge of

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