448 



Dr. E. Frankland. On the Conditions [Mar. 



$> 2,600 

 . Z.,700 



4000 U,000 



4,300 ,000 



4,400 

 4.300 

 4.HOO 

 4,100 

 4-.000 



3.000 



3.SOO 16,000 

 3 400 



17,000 



16,000 



1.4-00 

 ',300 



(COO 



DlAGEAM NO. 3. 



. IB9t IB 93 '094 



Mm.Jun.Jli. MSepQef.Hot! Dec Jin. Ftb.KirWKty.JunJly.Au6 Sep Pel: NwDet Jin fehfor. fiprlMwlvr. Jk AU& Sep Od&t Oft. 



500 12,000 

 11,000 



900 10,000 



7,000 

 6.000 

 ff,000 

 4,000 

 3,000 



T 



the flow of the river was sinmltaneously reduced to 985 millions of 

 gallons daily. 



In the following months, May, Jane, July, August, and September, 

 the river remained low, and so did the number of microbes ; but in 

 October, with an increase of flow from 159 to 543 millions of gallons, 

 the number of microbes increased from 1,158 to 13,790 per cubic 

 centimetre; whilst, in the following month of November, the flow 

 of the river was reduced to 249 millions of gallons and the microbes 

 to 1,789 per cubic centimetre. Again, in the following month of 

 December, the flow of the river increased to 375 millions of gallons, 

 and the microbes to 6,316 per cubic centimetre. 



In .January, 1894, the flow of the river was augmented to 1,510 

 millions of gallons, and the microbes to the enormous number of 

 56,630 per cubic centimetre. In the following months of February, 

 March, April, and May, the two curves follow each other with re- 

 markable regularity ; whilst in July, August, September, and October, 

 both the flow of the river and the number of microbes remained low, 

 there being a slight increase in both from September to October. 



