This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

This scarce antiquarian book is a selection from Kessinger Publishing's Legacy Reprint Series. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have made it available as part of our commitment to protecting, preserving, and promoting the world's literature. Kessinger Publishing is the place to find hundreds of thousands of rare and hard-to-find books with something of interest for everyone!

This scarce antiquarian book is a selection from Kessinger Publishing's Legacy Reprint Series. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have made it available as part of our commitment to protecting, preserving, and promoting the world's literature. Kessinger Publishing is the place to find hundreds of thousands of rare and hard-to-find books with something of interest for everyone

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: 1 --4left inferior rectus.p Otherwise there would be diplopia. Correct this error -fty-ither exercise or operations, then these two basal centers would lapse into their normal state of rest. The result?restful state of both muscles and brain centers?would be represented by Plate VII. Plate XXVI. represents the upward version of the same pair of eyes. The first conjugate center sends an equal amount of neuricity to both superior recti, but with unequal results. The tonicity of the left superior rectus being greater than that of the right superior rectus, the right eye would not rotate as fast as the left unless supplemental neuricity should be sent by the right first basal center to the weak right superior rectus. In upward version the seventh conjugate center is active to prevent inward torsion- ing of the eyes. The abnormal work done by both brain and muscle in the upward rotation is shown by contrasting Plate XXVI. with Plate XI, the latter showing the upward rotation of orthophoric eyes. This abnormality consists of activity of the right first basal center and the excessive contraction of the right superior rectus. If the first and seventh cortical centers cause no symptoms in the upward rotation of orfhophoric eyes, these centers, doing precisely the same work in superverting hyperphoric and cataphoric eyes, as shown in Plate XXVI., can cause no symptoms. The discomfort, therefore, must come from excitation of the right first basal center and the resulting excessive con- ' ' 1J. FLAZEZXYZI traction of the right superior rectus. Giving equal tonic- ity to the superior and inferior recti by either exercise or operations, allows the right first basal center to remain inactive in the upward rotation, hence there could be no symptoms. Plate XXVII. represents the d...