152 University Geological Survey of Kansas. 
" It will be noticed that with this method of combination the 
sample said not to make a good plaster by itself contains much 
more calcium carbonate than the others. Whether this retards 
the set because it takes the place of so much calcium sulphate, 
or whether it acts as a true retarder, as discussed farther over, 
would have to be determined by comparing a number of sam- 
ples that were similar in other respects. 
GYPSITE FROM SALINA. 
Two samples received in 1892 were analyzed by Prof HE. C. 
Franklin, with the following result : 
No. 1 No. 2 
Silica and insoluble residue...... PR oa ee ee pegtahl = 208) Sa 34.35 9.73 
Iprovay Gavel AkwnoniobHAN OBAGI s cuscoooveccaude, wade ooodvubooves Apelall 0.78 
Masnesiumscarbonateriin fa.stcicmcat hare ta ei Nano ae ae 10.52.| trace. 
Cale CATDOMate ss ilies ice Uy Re eee ae bat Mee Ne aetna is een NOR 8.14 4 32 
Calciumysulphatermes eee eae Fianaya shisha ADT aa ey Saal ae 34.38 68 .29 
Water (iby iditlerence)) see vers: ude fe eae te eae ie eee 8.50 16.88 
A BCG eo lala aaa Ra eR eae ee Un eOR ie amen i ut ae Che Sie ie ae ce a 100 100 
GYPSITE FROM LONGFORD. 
This is used at the mill of the Salina Cement Plaster Com- 
pany.* ¥ 
Silica and insoluble residue ............... grt teen ee 10.23 
Iixoray Gravel AYKUDTANI OHO, OOMNGS oc obosoonocebapooudo cede odeoen elie? 
Calciumioxide: ne! sea ee oe ene I ee eae 30.78 
Maonesium: oxideny ie seam cn my iicee eee ete cae errors 0.45. 
Sul phunicianiy crid ex eee ieee oe Poca eed deere repeat. 34.56 
Carbontdioxiderl(calculated) ye eee eee ere 5.67 
Walt Kass We So Ae eI etek Oe es SR Wea A OER 17.10 
Combining the above constituents, the probable composition 
would be: 
Silicasandsinsolubleomesichilceia ere ee ene 10.23 
lrontandraluminumloxiGdesme eee I Ape Re UCR A eel, 
Wile yenaxssphbbany Bye OMNI 6 660060000000 6000 0090 000000000000 0.94 
Calcium carbonates aan vi cede ecient earn in ares bs 7 
Calcium sulphate gs <a. sale eae eta aie 58.75 
Wie BOT t))s tothe Wii cin NC mnt) a Orestes Ua en SN a RC UD oat 17.10 
PO Gales ay ARON AE SUG: 5 PD AGIA Mien UMD A PCIE Te ne 99.91 
84. Analysis by Bailey and Stafford. 
