TABLE OF CONTENTS. 



LETTER OF TRANSMITTAL, ....-in 



PREFACE, _------- v 



PAET I. 



HISTORICAL. 

 PREFATORY NOTE, 3 



ANNUAL REPORT FOR 1873. 



BY I. A. LAPHAM. 



Law of the Survey Organization of the Corps Prof. Irvrng'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 Fall Relation of the 

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



ANNUAL REPORT FOR 1874. 



BY I. A. LAPHAJI. 



Details of Progress Prof. Irving's Party Prof. Chamberlin'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 O. 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 Hamilton, or Lower Helder- 

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



