177 



South Manitou, Michigan, Aug. 81, lat. 45° 05' N., long. 85° 38' 

 W., Dip 75° 59'. 3. 



Chicago, Illinois, September 2, lat. 41° 53' N., long. 67° 44' W., 

 Dip (mean of two series at two stations) 72° 47'. 7. 



Galena, Illinois, September 4, lat. 42° 28' N., long. 90° 13' W., 

 Dip (mean of two series at two stations) 73° 02'. 1. 



Galena, Illinois, September 13, lat. 42° 28' N., long. 90° 13' W., 

 Dip 73° 03.0. 



Mineral Point, Wisconsin, Sept. 6, lat. 42° 51' N., long. 89° 58' 

 W., Dip 73° 23'. 2. 



Mineral Point, Wisconsin, Sept. 10, lat. 42° 51' N., long. 89° 58' 

 W., Dip 73° 23'cO. 



Blue Mounds, Wisconsin, Sept. 7, lat. 43° 00' N., long. 89° 36' 

 W. 5 Dip 73° 34'.9. 



Madison, Wisconsin, Sept. 8, lat. 43° 03' N., long. 89° 11' W., Dip 

 (mean of two series at two stations) 74° 06'. 5. 



Campbell's, Wisconsin, Sept. 9, lat. 43° 01' N., long. 89° 26' W., 

 Dip 73° 28'.1. 



Hickok's, Wisconsin, Sept. 9, lat. 42° 58' N., long. 89° 47' W., 

 Dip 73° 39'.5. 



Platteville, Wisconsin, Sept. 11, lat. 42° 43' N., long. 90° 14' W., 

 Dip (two series at two stations) 73° 17'.4. 



Peru, Illinois, Sept. 16, lat. 41° 23' N., long. 89° 05' W., Dip 

 (two series at two stations) 71° 51 '.1. 



Pekin, Illinois, Sept. 18, lat. 40° 35' N., long. 89° 36' W., Dip 

 71° 13.2. 



Copperas Creek, Illinois, Sept. 18, lat. 40° 30' N., long. 89° 48' 

 W., Dip 71° 04'.0. 



Alton, Illinois, Sept. 22, lat. 38° 54' N., long. 90° 04' W., Dip 

 (two series, at two stations) 69° 34'. 8. 



Upper Alton, Illinois, Sept. 22, lat. 38° 55' N., long. 90° 03' W., 

 Dip (two series, at two stations) 69° 45'.7. 



Edwardsville, Illinois, Sept. 23, lat. 38° 50' N., long. 89° 53' W., 

 Dip 69° 57'.7. 



Bunker Hill, Illinois, Sept. 24, lat. 39° 04' N., long. 89° 53' W., 

 Dip 69° 49'.1. 



Monticello, Illinois, Sept. 25, lat. 38° 57' N., long. 90° 05' W., 

 Dip 69° 38'.9. 



St. Louis, Missouri, Sept. 29, lat. 38° 38' N., long. 90° 04' W., 

 Dip 69° 25'.5. 



