472 



Profs. Percy Frankland and Marshall Ward. 



In the water, therefore, kept at the summer temperature there was 

 a continuous decline in the total number of bacteria, nor was there, 

 apparently, any multiplication of the water forms; whilst in the 

 water kept at a winter temperature, not only was there a slight 

 numerical increase, but also, obviously, a considerable multiplication 

 of the water-bacteria as evidenced by the increase in the number of 

 liquefying colonies. 



In the following tables are recorded the results of the examinations 

 by phenol-broth culture of the several unsterilised Loch Katrine 

 waters, both infected and uninfected : 



Examination of Unsterilised Loch Katrine Waters (First Series) by 

 Phenol Broth-culture, 8.7.1893.. 



From the above table it will be seen that all the waters rendered 

 the phenol broth-tubes turbid, those infected with the B. coli com- 



