PREFACE TO FIRST EDITION vii 



Whipple, Jordan, and their pupils and associates (not 

 to mention others) have been pioneers in the develop- 

 ment of this new field in sanitary science. To gather 

 the results of their work together in such form as to 

 give a correct idea of the best American practice is 

 the purpose of this little book; and this we have tried 

 to do with such completeness as shall render the volume 

 of value to the expert and at the same time with such 

 freedom from undue technicality as to make it reada- 

 ble for the layman. It should be distinctly understood 

 that students using it are supposed to have had before- 

 hand a thorough course in general bacteriology, and 

 to be equipped for advanced work in special lines. 

 Boston, March lo, 1904. 



