1896.] on the Past, Present and Future Water Sup2)l2j of London. 59 



question. By his discovery of a means of isolating and counting tlie 

 number of bacteria, or bacilli, or microbes, and their spores in a given 

 volume of water, we were for the first time put into possession of a 



PROPORTIOMAL AMOUNT OF ORGANIC OlMENTS 

 IN RAW LEA AND EAST LONOCW COMPAKlYlS WATER. 



7-0 

 6-0 

 5-0 

 4^ 

 SO 

 20 

 \0 



Fig. 4. 



method by which the condition of water as regards these living organ- 

 isms, before and after filtration, can be determined with quantitative 

 exactness. The enormous importance of this invention, which was 



PR0P0Rtl(5RAL AMOUNT OF ORGANIC ILEIviENTS 

 IN NEW RIVER AND DEEFWELL WATERS. 



1895 



JAN FEB MAR AP MAY JVNE JULY AUC SEPT OCT NOV DEC. 



xcnconRSucr 



A 



.... ^V-M^.e , 



. u/»rj^' 



V 



Fig. 5. 



first made known and practised in England in 1882 by the late 

 Dr. Angus Smith, is evident when it is borne in mind that the living 

 organisms, harmful or harmless, contained in water arc of such 



