CXll 



in favor of the affirmative view^. In support of the latter opinion 

 the testimony of Dr. Miller, of King's College, London, based 

 upon analyses of Thames water taken at various points, was 

 quoted. The question was of especial interest to St. Louis at 

 present, in view of the expected appearance of cholera during 

 the coming summer. To be able to answer the question with 

 reference to the Mississippi river water at this point. Prof. Potter 

 had taken samples of the same body of river water as it passed 

 the water-works, foot of Lesperance st., Carondelet, Quarantine, 

 and Crystal City ; and, from analyses of these samples, whose 

 results are given in the accompanying table, it appears that the 

 river water is purer at quarantine than at the water-works, which 

 shows that sewage is absorbed by running water. Doubtless also 

 the mineral matter in suspension, in settling, precipitates more 

 or less of the organic matter. Prof. Potter said there was no dan- 

 ger to be apprehended from sewage thrown into the river at towns 

 above this city. . 



Water- Lesperance Caron- Qviaran- Crysta 1 



works. street. delet. tine. City. 



Total solids *2i7.oo 295.00 253.00 210-00 215.00 



Org. and vol 67.00 103.00 101.00 65.00 69.00 



Chlorine 7.75 17-50 8.00 7.50 7.75 



Oxygen, 20 minutes .... i . 13 1.85 1.25 i.oi 1.19 



4 hours 4.22 4.71 4.60 3.79 4.31 



Free ammonia o-oi 1.23 o.oi 0.004 0.26 



Alb. " 0.065 0.18 0.088 0.055 0.18 



* Parts in one million. 



Prof. Potter also exhibited the following results of analyses of 

 sewage, samples taken as indicated in the table : 



Av. ;o samples. Rutger st. Trudeau st. Arsenal st. 



Total solids *i3o6.oo 1071.00 1789.00 1310.00 



Org. and vol 45-io 377-oo 1165.00 489.00 



Chlorine 305-75 278.25 125.25 404-25 



Oxygen, 20 minutes 40.66 



" 4 hours 71-36 



Free ammonia 121.24 



Alb. " 1.64 



* Parts in one million. 



Results were also shown of analyses of Missouri river water^ 

 and of Mississippi river water taken above Alton, as follows : 



