SAUNDERS' QUESTION-COMPENDS, No. 20 



ESSENTIALS 



BACTERIOLOGY 



BEING A 



CONCISE AND SYSTEMATIC INTRODUCTION TO THE 

 STUDY OF BACTERIA AND ALLIED MICROORGANISMS 



BY 



M. V, BALL, M.D. 



MEMBER OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA ; FORMERLY 

 INSTRUCTOR IN BACTERIOLOGY AT THE PHILADELPHIA POLYCLINIC. 



ASSISTED BY 



PAUL G, WESTON, M. D. 



PATHOLOGIST STATE HOSPITAL FOR INSANE AT WARREN, PA. 



SEVENTH EDITION, THOROUGHLY REVISED 



With IIS Illustrations, some in Colors 

 PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 



J9J3 



