75 



Indian mounds, on the eastern shore of the Mississippi, which is to be 

 called South Albany. It is in Illinois, and is situated a little more 

 than a mile below Albany. By our survey, and an observed azimuth 

 of the star Polaris, connected with the above astronomical station, 

 we make the tallest Indian mound, which will be preserved, according 

 to the plan, in the public park of South Albany, in — 

 Latitude, .... 41° 46' 35" N. 



Longitude, west of Greenwich, - - 6/t. OOm. 56.93s. 



Equal, in arc, to ... 90° 14' 14" W. 



Note. — The west end of the ferry which crosses the stream drain- 

 ing the Marais des Osiers (corrupted into '•'■ Meredosia Marshes''' on 

 some of the maps, and into '-'■Marais d' Ogee'''' on t)thers) near the left 

 bank of the Mississippi, on the stage road between Albany and the 

 City of Rock Island, was found, by an offset in our survey between 

 Albany and Camanche, to be in — 



Latitude, .... 41° 46' 11".6 N. 



Longitude, - - 6/i. 00m. 59.9s. = 90° 14' 58".5 W. 



XVI. CAMANCHE, IOWA. 



This town is situated on the western shore of the Mississippi. 



By triangulation from our observing station at Albany, and an ob- 

 served azimuth of Polaris to obtain the true meridian, we derive the 

 position of Camxnche, as follows, viz. — 



Nicollet's map gives the latitude of Camanche — 1' 22" less, and 

 the longitude + 10' 20" greater than the above. He probably had 

 no observing station near this point, but depended on other authorities 

 for its position. 



