8 University Geological Survey of Kansas. 
CHAPTER VIII.—The Chemistry of Gypsum, Plaster of Paris, and Comentenn 
Plas teriend chee Un ean eer ae te pee Raper tee Veh BNR MEG ROR Ze 9 IC aL 134 
lomportancetandeDistrilouGronie iy Gayo SU are etree ee rn eee 134 
Hormation, of Gypsum eds eerie vey cena attest ee 134 © 
Compositioniof#Srines eee ae ane Pes e ccS ae Fea UN Ba 135 | 
ANHMKANS Ore JalOnTmelaiwostorn IBIAS. c 55 ddod oo ocdocnce beso esucousgogae 136 
Composition of Native Gypsum.................. access PERO REA UeEE 140 
Methods: of Amalysis etcar cack Sarde ane ehcee ays on oat en EEN AEN rl Us nt 144 
Kansas Gypsum) Wocalities oe ea ra seat ee are ene aa ea ae 145 
Analyses of Gypsum Rocks): 42 pen oon sass Cone ee re Senn ea 145 
Analyses otuGypsites (Gayosuinys Hy ant hy epee eee eee ae 149 
ObservationsiuponythelCompositionaneyer ene eee ate ener ae 155 
Necessity of a Careful Sampling of a Deposit......................... 157 
Plaster of Paris and Cement Plaster as they,Appear on the Market... 159 
Chemistryjot thesManufachureloteelastenae ae eer eee eee 161 
Retarders,and Accelerators mii yee den teen eeu Stele LeU ON A 167 
Uses of Gy psu. yi) ee OR ea eA NRCS er Tee a ASIP eae aA 168 
iProblemsieroposedtiorinvesticationwa een eae eae eee 169 
CHAPTER TX] S tatis tics ie essai ante un inictne caeye aren aaa nme 17a 
TasBLE I. Gypsum Production in the United States, by States........ salt 
TasLE II. Gypsum Imported into the United States................. We 
Tas.eE IIT. Production of Gypsum in the United States, by Years.... 172 
Taste IV. Graphic Outline of Gypsum Production of Kansas.. ..... 173 
CHAPTER\X Bibliography. se sien ee ee I eee rena arene 174 
GENER AT TN DE Re 0k Bens Werte Sik neh ck GeRpiImnE  ertrait econ Neate Re 179 
