CONTENTS. VII 



THE CLAYS AND CLAY INDUSTRIES OF NORTHWESTERN 

 INDIANA. BY W. S. BLATCHLEY. 



PAGE. 



105 

 Introductory 



Definition of Clay ? ^^^ 



Origin of Clays ^^l 



Varieties of Clays ^^' 



Properties of Clays • ^^^ 



Impurities of Clays ;• 



The Clays and Clay Industries of Benton County 112 



The Clays and Clay Industries of Newton County 117 



The Clays and Clay Industries of Jasper County 121 



The Clays of Starke County 125 



The Clays and Clay Industries of Lake County 126 



The Clays and Clay Industries of Porter County 131 



The Clays and Clay Industries of Laporte County 138 



The Clays and Clay Industries of St. Joseph County 140 



The Clays of Jackson County • 1^3 



Chemical Analyses of Clays 14^ 



Statistics of the Clay Industries of Northwestern Indiana 150 



THE PETROLEUM INDUSTRY IN INDIANA IN 1897. BY W. S. 



BLATCHLEY. 



Location of Oil-Producing Areas • • • ■ 1'^'^ 



Origin of Petroleum 1'^'^ 



Trenton Limestone in Indiana 1^^ 



Oils in Arches or Anticlines 1^^ 



Necessity of Accurate Surface Levels • 1^' 



Pools Not Necessarily Connected 1^^ 



Salt Water in Indiana Field 1'^^ 



New Developments in the Indiana Field l'^9 



STATISTICS OF THE OIL INDUSTRY IN INDIANA 160 



THE ALEXANDRIA OIL FIELD 1^^ 



IfiQ 

 THE PERU OIL FIELD ^"'^ 



THE BROAD BIPPLE OIL FIELD ^ " - 



ON THE ADVANTAGES OF PRODUCING BEET SUGAR IN NORTH- 

 WESTERN INDIANA. BY E. L. FURNESS 18-5 



A REPORT ON THE NIAGARA LIMESTONE QUARRIES OF DECA- 

 TUR, FRANKLIN AND FAYETTE COUNTIES, WITH REMARKS 

 ON THE GEOLOGY OF THE MIDDLE AND UPPER SILURIAN 

 ROCKS OF THESE AND NEIGHBORING (RIPLEY, JEN- 

 NINGS, BARTHOLOMEW AND SHELBY) COUN- 

 TIES. BY AUGUST F. FOERSTE. 



I. GENERAL INTRODUCTION 1"*^ 



Valuable Courses of Stone 1^' 



Competition with Cement 200 



