96 iowa" academy of sciences. 



been removed. The water had a sparkling appearance and 

 a slight odor. When allowed to stand in a closed vessel 

 for some time it possessed a slight odor of urea. The anal- 

 ysis was made in September, 1901. 



Total solids 461. 



Loss on ignition 124 . 



Nitrogen as free ammonia . 066 



Nitrogen as albuminoid ammonia . 027 



Nitrogen as nitrates 6 . 666 



Nitrogen as nitrites .22 



Chlorine 2.7 



Oxygen consuming power 6 . 09 



The amount of nitrites found would, alone, condemn its 

 use as a potable water. 



Armour & Company obtain the water for their large 

 packing plant from two wells, 347 and 400 feet deep respec- 

 tively. The analysis was made in the latter part of Novem- 

 ber, 1901. 



Total solids 556. 



Loss on ignition 148. 



Nitrogen as free ammonia . 262 



Nitrogen as albuminoid ammonia .025 



Nitrogen as nitrates Trace 



Nitrogen as nitrites None 



Chlorine 8.3 



Oxygen consuming power 1 .568 



The Consumer^ s Ice Company obtain their water for man- 

 ufacturing ice from a well 122 feet deep and which is said 

 to pass through a stratum of rock into a gravel bed. It is 

 first distilled and then frozen in cans by means of salt 

 brine. The specimen was taken from a clear block of ice 

 weighing 300 pounds. The analyses were made in the lat- 

 ter part of November, 1901. If the ice is manufactured 

 entirely from the distilled water, we have no theory to 

 account for the fact that both the free and albuminoid 

 ammonia are higher in case of the ice water than from the 

 well water from which the ice was manufactured. The 

 presence of the chlorine may be explained by the careless- 

 ness of the operator in allowing brine to get into the water 

 before being frozen. 



1 

 1 



