CONTENTS 



PAGE 



Introduction 91 



Histon- 114 



Uses 117 



Portland cement 125 



Processes of manufacture. . 126 



Technology of gypsum 130 



New York mines and mills 137 



Production of gypsum in New York 148 



Analysis of gypsum 148 



List of firms and individuals that mine and manufacture 



New York gypsum 155 



List of manufacturers in New York State who use gypsum 



from outside of this State 156 



Bibliography 156 



