100 IOWA ACADEMY OF SCIENCES. 



Phosphoric anhydride (PjOc) Trace 



Aluminia (Al-^Os) 3.97 



Ferric oxide (FeoOa) Trace 



Calcium oxide (CaO) 120.05 



Magnesium oxide (MgO) 47.96 



Carbon dioxide (C:0^) 153.96 



PUMPING STATION No. 2. 



Sodium oxide (Na^O) 15.94 



Silica (SiOa) ... 32.19 



Potassium oxide ( K2O) 4.37 



Sulphur trioxide (SO3) 7.25 



Phosphoric anhydride (PaOs Trace 



Alumina (AbOs 3.805 



Ferric oxide (Fe Oa) Trace 



Calcium oxide (CaO) 130.42 



Magnesium oxide (MgO) 48.96 



Carbon dioxide (CO:) 170 . 55 



The following technical analysis of the water, taken from 

 the hydrant at Morningside college, was made in January 

 1901. 



Silica (SiOO 14.4 



Sodium oxide (NaaO 27.5 



Sulphur trioxide (SO') 12.5 



Alumina (AI2O3) 1.00 



Ferrric oxide CFe203) 30 



Manganous oxide (MnO) Trace 



Calcium oxide (CaO) 120.6 



Magnesium oxide (MgO) 53.9 



Carbon dioxide (CO2) 236.2 



A comparison of the results of the technical analyses 

 given above will reveal the fact that the mineral character 

 of the water has not greatly changed in ten years. Ferric 

 oxide was found in the last analysis, but this may have 

 come from the iron pipes, through which the water flows 

 for several miles. There is an increase in the amount of 

 sodium, silica, alumina, and magnesium but the general 

 character of the w^ater remains practically the same. 



A comparison of the sanitary analyses shows that there 

 has been some change in ten years. The free and albumi- 

 noid ammoniaremainabout the same, but the chlorides have 

 increased over two and one-half fold, the nitrates fifteen 



