1895.] affecting Bacterial Life in Thames Water. 



445 



DIAGKAM: No. 2. 



1893 ld94 



FetuHnhAffl Hay.JunMy.Aut>.Sep.Ccr. No*DecJan.FeAMrch.Apr(M{tJ!,nJu/tAudSe/iOcr Nov.Dec 



_u 



more than an hour of sunshine. In the following month of March 

 again, an enormous increase of sunshine was followed by a corre- 

 sponding decrease of microbes, and this relation was continued in the 

 following month ; but in May, with a great diminution of sunlight, 

 there was practically no increase of microbes, and in June, with an 

 enormous increase of sunlight, there was the anomaly of an increase, 

 though slight, of bacteria. 



In the following July and August, there were enormous alternations 

 of sunshine and gloom with no corresponding difference in the 

 number of microbes; whilst in September, with a great diminution 

 in sunshine, there was observed one of the smallest numbers of 

 microbes recorded. In the following month of October, however, a 

 small diminution of sunshine was accompanied by a very large in- 

 crease of microbes. On the other hand, in the month of November, 

 with a still smaller amount of sunshine there was an enormous 

 reduction in the number of microbes. 



In January, 1894, a small amount of sunshine was followed by an 



