Education Department Bulletin 



Published fortnightly by the University of the State of New York 



Entered as second-class matter June 24, 1908, at the Post Office at Albany, N. Y., 

 under the act of July 16, 1894 



No. 480 



ALBANY, N. Y. 



October i, 1910 



New York State Museum 



John M. Clarke, Director 

 Museum Bulletin 143 



GYPSUM DEPOSITS OF NEW YORK 



D. H. NEWLAND 



HENRY LEIGHTON 



PAGE 



Introduction 5 



History of the gypsum industry 



in New York 6 



Composition and characters of 



gypsum 8 



Uses of gypsum i r 



General geology 15 



Details of the distribution of gyp- 

 sum in New York 26 



Character of the gypsum in New 



York; chemical analy>es 59 



PAGE 



Permanence of the gypsum supply 61 

 Methods of prospecting and ex- 

 ploiting the gypsum deposits.. 6[ 



Origin of gypsum 64 



Properties of gypsum and theory 



of its transformation to plasters. 71 



Technology of gypsum plasters. . 79 



Bibliography 89 



Index gi 



