346 Chemical Laboratory, University of Minnesota. 



The depth of this well was stated at about I5(X) feet. The 

 strata passed through were as follows : Black soil two feet, blue 

 clay 18 feet, bluish shale 1,400 feet, conglomerate, three feet. Im- 

 mediately below this shale a small flow of water was reached. 

 The drill then passed into quicksand nearly white and very fine. 

 This was penetrated about 15 feet. The sand came up the pipe 

 with the water. The pressure of outflow is light, but a stream 

 about two inches in diameter constantly flows. 



May 5, i8pi. 



ANALYSES OF SEVEN SAMPLES OF EFFLORESCENCE FOUND ON RED 



PRESSED BRICK. — C. F. Sidener. 



Sample No. i. — From College of Mechanic Arts building 

 State University, Minneapolis, Minn. 



Sodium sulphate, 90.1 per cent. 



Calcium sulphate, 1.4 " 



Water, 8.5 " 



lOO.O 



Location — damp. 

 Coating — thick 



Sample No. 2. — From Union Station, Saint Paul, Minn. 



Magnesium sulphate, 78.57 per cent. 

 Magnesium carbonate, 4.64 " 

 Water, 16.79 " 



100.00 

 Location — damp. 

 Coating — thick 



Sample No. 3.- — From brick wall at northeast corner of 

 Court house block, Saint Paul, Minn. 



