CONTENTS. xi 



CHAPTER XXVII. 



PAGES 



Bacteriological study of water, air, soil — Methods em- 

 ployed — Precautions to be observed — Apparatus used and 

 methods of using them 418-441 



CHAPTEE XXVIII. 



Methods of testing disinfectants and antiseptics— Ex- 

 periments illustrative of the precautions to be taken — 

 Experiments in skin-disinfection 442-454 



APPENDIX. 



Apparatus necessary in a beginner's bacteriological 

 laboratory 455-400 



