The text of this e-book has mostly been preserved in its original form, including some archaic spellings. Footnotes have been numbered and positioned below the relevant paragraphs, and some illustration captions moved closer to the relevant text. _Underscores_ have been used to denote italic text. S. LEWIS ZIEGLER, A.M., M.D., Sc.D. Attending Surgeon, Wills Eye Hospital; Ophthalmic Surgeon, St. Joseph’s Hospital. PHILADELPHIA.…
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