94 IOWA ACADEMY OF SCIENCES. 



specimen for the technical analysis was obtained February 

 15, 1901, and the specimen for the sanitary analysis was 

 obtained October 2, 1901. 



TECHNICAL ANALYSIS. 



Calcium oxide (CaO) 83.9 



Magnesium oxide (MgO) 27.2 



Silica (SiO^) 27. 



Caibon Dioxide (CO») . 98.7 



Sulphur tri.'xide (SO3) 14.7 



Alumnia (AI..O3) 7.2 



Ferric Oxide ( Fe„03) 8 



SANITARY ANALYSIS. 



Total solids 226 . 



Loss on ignition 70. 



Nitrogen as free ammonia 101 



Nitrogen as albuminoid ammonia 320 



Nitrogen as nitrates 1 . 000 



Nitrogen as nitrites None 



Chlorine 13 . 775 



Oxygen consuming power . . 10. 192 



Albuminoid ammonia continued to come off until the 

 containing vessel broke. 



From the above analysis we would not consider the water 

 of the Half Moon a good potable water, yet a consider- 

 able portion of the ice used in Sioux City is taken from this 

 lake. It is not probable that any of the filth from the 

 Armour packing house seeps into the lake, as has popularly 

 been suspected, since the surface of the lake is higher than 

 the surface af the Floyd which is less than one-fourth mile 

 away and the high railway grade between the packing 

 house and the lake would prevent any surface water from 

 flowing in. 



The Well Water at 1609 Orleans Avenue, Morningside, is 

 located on the low ground east of Longfellow schoolhouse. 

 It is a dug well eighty-five feet deep. There are several 

 water closets within a few rods, and several others have 

 been located in the immediate locality during the past 

 twelve years. The technical analysis was made in the 

 month of March, and the sanitary analysis in May, 1901. 



