62 GEOLOGICAL SURVEY OF WISCONSIN. 



1. Intersection of the fourth principal meridian with the state line between lUinoia 

 and Wisconsin, lat. 42° 30' 26.1"; long. 90° 25' 33.6". 



2. First section corner of the Wisconsia survey on the state line west of the fourth 

 pi-hicipal meridian, lat. 42° 80' 26.4"; long. 90° 26' 44.2". 



3. Southeast comer of section 18, township 18, range 1 west, lat. 44° 1' 49.6"; long. 

 90° 25' 56". 



4. Northeast comer of section 1, township 18, range 1 west, lat. 44° 4' 26.6"j long. 

 90° 25' 56.7". 



5. Southeast comer of section 31, township 21, range 3 east, lat. 44° 14' 57.3"; long. 

 90° 10' 45.8". 



6. Southwest comer of section 31, township 21, range 3 east, lat. 44° 14' 57.2 "; long. 

 90° ir 48.9". 



Points Nos. 5 and 6 are on the correction line between townships 20 and 21, near 

 Balch's Ranch, on the Wisconsin Valley Railroad. 



On the correction line between townships 30 and 31, range 19 west, east of the St. 

 Croix river. 



7. Southeast comer of section 34, township 31, range 19 west, lat. 45° 7' 21.8"; long. 

 92° 41' 24.6". 



8. Southwest comer of section 33, township 31, range 19 west, lat. 45° 7' 22.1"; long. 

 92° 43' 52.1". 



The following local bearings were determined: 



1. The state line between Illinois and Wisconsin, from its intersection with the fourth 

 principal meridian, bears W. 16' 17" N. to point No. 2 above. 



2. The fourth principal meridian, from the southeast comer of section 13, township 18, 

 range 1 west, bears N. 11' 10° W. to point No. 4 above. 



3. The correction line between townships 20 and 21, from the southeast comer of sec- 

 tion 31, township 21, range 3 east, bears W. 5' 18" S. to point No. 6 above. 



4. The correction line between townships 30 and 81, from the southeast comer of sec- 

 tion 34, beais W. 10' 20" N. to point No. 8 above. 



In accordance with an act of congress, and upon application from 

 the state geological survey, as explained in my last report, the super- 

 intendent of the coast survey has made arrangements for the prosecu- 

 tion, with suitable instruments, of geodetic surveys within this state. 

 These will consist of ^ the determination, by the accurate methods of 

 that survey, of the geographical position of certain prominent points, 

 and the measurement of a base line, from which, by a connected sys- 

 tem of triangles, with sides ten to twenty or more miles in length, aa 

 amount of exact knowledge of the geographical and topographical fea- 

 tures of the state will be acquired, sufficient for tlie projection of a 

 correct map. These surveys when completed and properly connected 

 with the lines of the land survey will leave nothing to be desired. 



The work of the past season has been the determination of the lati- 

 tude and longitude of Madison and La Crosse, and reconnoissance 

 necessary for the selection of suitable triangulation stations, along the 

 valley of the "Wisconsin river from Prairie du Chien to Kilbonrn 

 City. This important survey is very properly placed in the hands of 



