ACKNOWLEDGMENT 



My special thanks are due to the Provost, Dr. F. J. von 

 Rapp, to the Dean, Dr. W. A. Pearson, and to the Medical 

 Council of the Hahnemann Medical College and Hospital 

 of Philadelphia, particularly to Dr. H. M. Eberhard of this 

 group to whom I herewith wish to dedicate this book; also 

 to the following members of the staff of the Hahnemann 

 Medical College: Dr. G. P. Miley, Dr. R. E. Seidel, Dr. 

 H. Wastl, Miss A. Bechtel, Miss K. G. Smith and Miss E. 

 Colie for their help and advice. 



I am particularly indebted to Colonel John W. Tucker, 

 LL. D. whose great experience was invaluable in editing 

 this book: and to Mr. Robert S. Gill, treasurer of The 

 Williams & Wilkins Company, whose encouragement and 

 help in editing the manuscript were indispensable for its 

 completion. 



With best thanks I wish to acknowledge the help of Mr. 

 George Calle, a skillful mechanic of the Hahnemann Hospital 

 of Philadelphia who prepared excellent drawings for the 

 illustrations in this book; finally I wish to thank my good wife 

 and my son Karl R. Beutner, a student at Dickinson College, 

 Carlisle, Pennsylvania, for their devoted help. 



R. Beutner. 



Philadelphia, October 193S. 



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