[A symposium, if I understand it correctly, is generally arranged in such manner that different aspects of a vital question are distributed among different men, that each one may bring out best the side nf the question best known to him. If this definition be correct. I beg to preface my paper by the statement that I hare purposely deviated from this ideal. It would have been necessary to dwell on a great many technical details of a, to some at least,terra incognito. For this reason I thought it more expedient—and endeavored to express it in the title of my paper—to draw attention to the frequency, the multiform manifestations and the importance of syphilis of the eye from two viewpoints: the often serious results and the diagnostic value of syphilitic affections of the eye.]