CONTENTS. xi 



CHAPTER XXVI. 



The nitrifying bacteria The bacillus of tetanus The 

 bacillus of malignant oedema The bacillus of sympto- 



. matic anthrax Bacterium Welchii Bacillus sporo- 

 genes 507-536 



CHAPTER XXVII. 



Infection and immunity Mechanism Specific bodies 

 and reactions Doctrines in exploration 537-584 



CHAPTER XXVIII. 



Bacteriological study of water Methods employed Pre- 

 cautions to be observed Apparatus used and methods 

 of using it Methods of investigating air and soil Bac- 

 teriological study of milk Methods employed .... 585-617 



APPENDIX. 



Apparatus necessary in a beginner's bacteriological lab- 

 oratory 619-624 



