TABLE OF CONTENTS. 



Letter of Tbansmittal, -.... ,jj 



Pbeface, ....y 



I^AET I. 

 HISTORICAL. 



Prefatory Note, 



ANNUAL REPORT FOR 1873. 



BY I. A. LAPHAM. 



Law of the Survey — Organization of the Corps — Prof. Irving's Party — Prof. Cham- 

 berlin's Party — Mr. Strong's Party — Mr. Wilson's Map — Practical Importance 

 of Geological Knowledge — Mr. Edgerton's Survey — Topographical Survey — 

 Railroad Elevations — Elevation of Lakes — Elevation of Summits — Government 

 Surveys — Catalogue of Minerals — Mineral "Waters — Rain FaU — Relation of the 

 Geological Survey to Agriculture — List of Maps Accompanying the Report, 5-44 



ANNUAL REPORT FOR 1874. 



BY I. A. LAPHAM. / 



Details of Progress — Prof. Irving's Party — Prof. Chamberhn's Party — Mr. Strong's 

 Party — Surveys in Oconto County by Maj. Brooks — Determinations of Latitude 

 and Longitude by the U. S. Engineer Department — Geodetic Survey under Dr. 

 Davies — Mr. Ives' Survey — Chemical Work — List of Maps and Sections Accom- 

 panying the Report — List of Papers Accompanying the Report, - - 45-66 



ANNUAL REPORT FOR 1875. 



BY 0. W. WIGHT. 



Brief History of Previous Geological Surveys in Wisconsin — Reconnoissance made in 

 the Northern Part of the State under the Personal Direction of the Chief Geologist, 

 During the Latter Portion of the Season of 1875 r- Hamilton, or Lower Helder- 

 burg — Artesian Wells — Mineral Springs — Acknowledgements, - 67-89 



