VI MICRO-ORGANISMS IN WATER 



of pathogenic bacteria in water, whilst a separate 

 chapter has been devoted to the comparatively novel 

 subject of the bactericidal action of light. Finally, we 

 have appended a concise description of the principal 

 characters of all the micro-organisms, numbering up- 

 wards of 200, which, as far as we have been able to 

 ascertain, have hitherto been found in water ; and it is 

 hoped that this descriptive catalogue of water bacteria 

 may prove of some value in the at present bewildering 

 task of identifying the different microbial forms met 

 with in natural waters. 



P. F. F. 



G. C. F. 



DUNDEE : April, 1894. 



