VI PREFACE TO SECOND EDITION. 



study has certainly become one of great interest to all 

 scientific students of medicine. 



In the preparation of the present edition we have 

 endeavored to utilize the latest and best information, and 

 we can only express our thanks for the encouragement 

 which we have received from so. many sources and hope 

 that the present eifort will justify no censure. 



University op Michigan, Sbptembkr, 1891. 



