98 IOWA ACADEMY OF SCIENCES. 



ANALYSIS BY WRIGHT. 



Carbonate of lime (CaCOa) 6.654 



Magnesium carbonate (MgCOa) 5.527 



Iron carbonate ( FeCoa) 3 . 797 



Aluminum sulphate (Al2(S03) 22.073 



Magnesium sulphate (MgS04) 10.037 



Nickel sulphate (NiS04) 1 . 141 



Calcium sulphate (CaS04) 6.839 



Sodium sulphate (Na2SOj) 3.751 



Potassium sulphate (K2S04) 2.115 



Iron sulphate (FeS04) 13.402 



Sodium Phosphate (Na2HP04) 1.667 



Silica (SiOs) 1.882 



Organic matter .864 



The City Water Supply comes from 104 driven wells 

 ninety feet deep. The source is beneath an impervious 

 stratum of clay. The water is stored in a reservoir 150 

 feet in diameter, located on an eminence north of the city, 

 from whence it is distributed to consumers. The reservoir 

 is surrounded by an iron fence and carefully guarded. In 

 the summer there is to be seen occasionally a green growth 

 on the water which is so common to bodies of standing 

 water in the summer months, but the tank is emptied 

 and cleaned every three weeks. The specimen for 

 Analysis I was taken from the hydrant at Morningside 

 college, which is located six miles from the reservoir, in 

 May, 1901. The specimen for Analysis II was taken at 

 pumping station No. 1, in May. It will be observed that 

 the results of the two analyses are practically the same. 

 The specimen for the technical analysis was taken at 

 Morningside college in February, 1901. 



ANALYSIS I. 



Total solids 415 . 



Loss on ignition 167 . 



Nitrogen as free ammonia . 022 



Nitrogen as albuminoid ammonia 0232 



Nitrogen as nitrates 12.4 



Nitrogen as nitrites Trace 



Chlorine 8.9 



Oxygen consuming power .6 



