Artesian Well Borinrj in Southeastern Minnesota — Hall. 137 



how these two h)calities compare with the general results just 

 ^iven you. 



1. Deep well water from Hastings, furnished the writer by 

 \V. H. Holden; analysis by Professor J. A. Dodge: 



Silica, SiOj 0.62 grains per gallon 



Carbonate ot lime, Ca CO^... 9.29 " " 



Carbonate of iron, FeCO, 0.17 " " 



Sulphate « 1 raiignesia, MgSO+ 5 84 " " 



Chloride of mganepia. Mg Cig 3.82 " '* 



Chloride of potassium, K CI , 1.15 " " 



( hloride of sodium, Na CI 26.15 " " 



Total 45.04 



The large amounts of sulphate of magnesia and chloride of 

 sodium make this water a peculiar one. The action of these sub- 

 stances on locomotive boilers has proved very injurious. 



2. West Hotel water, Minneapolis. Analysis by C. F. Sidener: 



Silica, Si O2 .^ 0.81 grains per gallon 



Alumina, AI2 O3 0.02 " " 



Carbonate of lime, CaCOj 12.88 " " 



Carbonate of magnesia, Mg CO3 6.04 " " 



Carbourteof iron,FeC03 0.12 " " 



Sulphate of magnesia, Mg SO4 0.14 " " 



Sulphate of potash, K2 SO4 0.33 



Sulphate of soda. Nag SO4 1.25 " 



Chloride of sodim, Na CI 0.06 " " 



Phosphates traces 



Nitrates and nitrites traces 



Total 21.65 



Free ammonia .*. 02 '* " 



Albumenoid ammonia traces 



Hardness, 15 degrees. 



To show before the eye the succession of strata just named 

 with the relative thickness of each, as well as the corpparative 

 depth of the wells thus far bored in the Mississippi river valley 

 Plate II has been prepared. To make it clear to all, the following^ 

 synopses are given:* 



I. Lake WOOD Ce.meteky Wei>l--C. W, Hall. 



Formation 1. P^xtends from the surface, about 925 above the sea, to a 

 depth of 256 feet. Consists of gravel with large bowlders of granite and 

 diabase with some sand stone, sand and clay. 



2. Not known to occur in this portion of the state. 



;5. Not known to occur in this portion of the state. 



4. Not detected in the borings, save as pieces in No. 1; very likely 

 absent at this place. 



*The Roman numerals in these synapses refer to the well numbers; the Arabic num- 

 erals correspond with those of the formations described on the preceding pages. 



