PREFACE 



THE present work is based on the notes prepared by 

 the writer for his class while teaching Public Health 

 Chemistry and Bacteriology. These were compiled from 

 various standard works, and from articles appearing in 

 the medical journals from time to time. No originality 

 is therefore claimed for them, and grateful acknowledg- 

 ment is made to the sources indicated.* 



The book is intended to assist in, and supplement, 

 actual laboratory teaching, and not in any way to super- 

 sede it. It has been the writer's endeavour therefore to 

 make it as complete as possible, while leaving out 

 matters which can be more satisfactorily taught and 

 demonstrated than written about. No illustrations have 

 been introduced, as the various instruments and apparatus 

 are seen and used in the actual work. 



I desire to express my hearty appreciation of, and my 

 best thanks for, the assistance received from a number 



* I am especially indebted to the following works : Fakes' " Hygiene," 

 Notter & Firth's " Hygiene," Moor & Partridge's " Aids to the Analysis 

 of Foods and Drugs," Richter's " Organic Chemistry," the " Harmsworth 

 Self-Educator," the " Encyclopaedia and Dictionary of Medicine and 

 Surgery," Jordan's "Bacteriology," Muir & Ritchie's " Bacteriology," Hiss 

 and Zinsser's " Bacteriology," Abel's " Laboratory Handbook," Stitt's 

 " Practical Bacteriology," Sims Woodhead's " Bacteria and their Products," 

 and the Lancet, Public Health, and the Bacteriological Supplement to the 

 Medical Officer. 



