IOWA ACADEMY OF SCIENCES 
109 
the Ordovician. The water contains twenty to twenty-five 
per cent less of calcium and magnesium carbonates than 
the other waters examined. This may result from an 
artesian character of the well, the water coming from 
sandstones underneath the Niagara; or a small adjacent 
stream may find its way into the well through fissures in 
the rock. Several analyses showing a varying amount of 
free and albuminoid ammonia may incline rather to the 
latter alternative. The analysis w T as made in May, 1900, 
by Miss Herrinton. 
Total solids £86 6 
CaCOs.... 154.9 
MgCOs 97 0 
SiOa . 23.00 
Fe 20 s and AI 2 O 3 80 
NaCl and KC1 24.00 
CO 2 free and partly united 114.00 
• CaSO* 4 08 
Nitrates 1 38 
Free ammonia 0 084 
Albuminoid ammonia 0.032 
6. The Cedar River. The sample was taken from the 
river at Ivanhoe bridge, May, 1900; analyzed by Mr. 
Rayner. 
Total solids 234 2 
CaCOs 147 1 
MgCOs 57.5 
Si02 2 0 
FesO and AI 2 O 3 2.2 
NaCl and KC1 20.0 
CO 2 free and partly united 80.0 
CaS04 . .. 5.1 
Nitrates 0.77 
Free ammonia 0.12 
Albuminoid ammonia 0.27 
In all the waters examined the ratio of magnesium car- 
bonate to calcium carbonate is about one to two with the 
exception of Mr. Young’s water where the ratio is one to 
three. 
We desire to thank Professor W. H. Norton for valuable 
suggestions in connection with these investigations. 
