CONTENTS 



CHAPTISR PAGE 



Introduction. 



I. Sterilisation and the Preparation of Culture Media 1 



II, The Staining and Microscopic Examination of Micro- 

 organisms . ... ... 42 



~^II. The Examination of "Water for Micro-organisms . 60 



■j^ IV. The Bacterial Contents of Various Waters . . 83 



V. The Purification of Water for Drinking Purposes 117 



^ VI. On the Multiplication of Micro-organisms . . . 217 



VII. The Detection of Pathogenic Bacteria in Water . 257 



VIII. The Vitality of Particular Pathogenic Bacteria in 



Different Waters .... . . 286 



IX. The Action of Light on Micro-organisms in Water 



AND Culture Media .... . . 333 



Appendix, containing tabular Descriptions of the various 



Micro-organisms found in Water . . 395 



Index . . ... 521 



