iv PREFACE. 



Polytechnic Institute, Pasadena, Cal. ; A. 1\ Ohlmacher, Medi- 

 cal Department, University of Wooster, Cleveland, Ohio j and 

 other well-known teachers of high standing. 



The manuscript pertaining to the eye has been corrected 

 by the well-known oculist, Dr. Casey A. Wood of Chicago, and 

 that on the ear by the specialist, Dr. T. Melville Hardie. 



To these the author wishes to express his sincere apprecia- 

 tion of their valuable assistance, and also to the following, who 

 have read the proof, and whose criticisms and suggestions 

 have been exceedingly helpful : A. C. Boyden, Bridgewater, 

 Mass. ; Dr. C. F. Hodge, Clark University, Worcester, Mass. ; 

 Dr. Frieda E. Lippert, New York ; Dr. L. B. Wilson, Uni- 

 versity of Minnesota, Minneapolis, Minn. ; Dr. Robert H. 

 Wolcott. University of Nebraska, Lincoln, Neb. ; W. E. 

 Wilson, State Normal, School, Providence, E.I. ; Dr. Adolf 

 Meyer, Clark University, Worcester, Mass. ; W. H. Chandler, 

 State Inspector of High Schools, Madison, Wis. ; Dr. H. B. 

 Ward, University of Nebraska, Lincoln, Neb. ; J. E. McGiJ- 

 vrey, Inspector of High Schools for the University of Illi- 

 nois, Champaign, 111. ; George B; Aiton, Inspector of High 

 Schools for the State of Minnesota, Minneapolis, Minn. ; J. 

 W. Crabtree, Inspector of High Schools for the University 

 of Nebraska, Lincoln, Neb. 



With this help it may be expected that the book will be 

 fairly free from errors, yet for such as may be found the 

 author alone is responsible. 



The author acknowledges his dependence on the larger 

 standard anatomies and physiologies, especially the Practical 

 Physiology by Foster and Langley, the Practical Physiology 



