2_ 



PREFACE TO SECOND EDITION. 



IN reviewing this work the author has made such additions 

 as were necessary to bring it to date as a concise presentation 

 of Bacteriology, as it should be understood by all students 

 and practitioners of medicine. He has broadened its scope by 

 including information on a few protozoa nearly akin to bac- 

 teria. This will make the book more useful to advanced 

 students, as well as to general practitioners seeking to enlarge 

 their knowledge of the microscopical world by attending spe- 

 cial post-graduate courses. 



The author acknowledges with thanks the very valuable 

 services rendered in the revision by Dr. W. H. Seeman, Pro- 

 fessor of Clinical Microscopy and Tropical Medicine in the 

 Post-Graduate Department of the Tulane University of 

 Louisiana. 



P. E. A. 



NEW ORLEANS, 1912. 



