PREFACE TO SECOND EDITION. 



THE speedy exhaustion of the first edition is a pleasing evidence 

 of the interest the medical profession of this country is taking in 

 the subject of surgical bacteriology. 



In the preparation of the second edition the author has aimed 

 to add new facts illustrative of the relations of pathogenic micro- 

 organisms to the various surgical lesions, and eight new illustrations 

 have been inserted in the text descriptive of microbes not illustrated 

 in the first edition. The book has also been divided into chapters, 

 which it is hoped will prove useful for a better classification of the 

 material and for more ready reference. 



N. SENN. 



CHICAGO, MARCH, 1891. 



