BAILEY. | Chemistry of Plasters. | 159 
of the insoluble substances would be increased in the mass, and 
we should have a material much like the deposits that we find. 
Water saturated with calcium carbonate, also coming in con- 
tact with the mass would be liable to deposit some of that sub- 
stance, and there might be an interchange of acid and base 
between the sodium carbonate and the calcium salts. 
PLASTER OF PARIS AND CEMENT PLASTER AS THEY 
APPEAR ON THE MARKET. 
The following analyses of some of the brands of these materi- 
als as they are offered for sale in open market may be of interest. 
None of these samples” was furnished by the manufacturers, or 
at their request. No. 1 is ‘‘Crystal Rock,’’ manufactured by 
the Great Western Plaster Company, at Blue Rapids; No. 2 is 
‘““Roman,’’ from Springdale, Barber county : 
Silicagandsincsolublegresidtiepieas rire te neni ie Senecio 120) AL Dil 
Ibikora, eras eiltewomrrae raay ORO lEIS) 3s ais ielern ae eons Godel GINO RCO Re eee 0.20 0.47 
(OBNKOME NTN ODSIGKS PSE of PS & Bb ote le OHI aN LE te EV ieee MS ORLA ee B50 6 Ts) 36.12 
IMFOMeS NUMA BO al Cl CR rer arta say eacany, CTH A Au AN alata ates wy eae Gav a\e 0.56 0.70 
SUMO UAE yale Chl ..6 soo yo did geo COO Sala On apie Sum emai 46.24 49.15 
Carboonicranmhydnridem (calculated) Amarante ate erCe re cee aloo Dele, 
NAV BBATE Aon Ue Bite es ine ou BT Dn ERVIN aC SE Ci ten at aN ar oie eee eR een 6.86 6.67 
If combined, the results would probably be: 
SHNGa, aiael tMCoOlU OO TRASICIO® ooo ccouos cose obog eden sdeeus eas 1.20 Oi 
ltroway @raye| iloroaTraNaN OSAOS 5 yes Gab es wid asec hed boel ER ao ooo ORME 0.20 0.47 
WMA SNeSIUIMY CAT WO Make were erie mrt terior n liek hae esis as oils shane tals 1.18 1.47 
Galciumeycarbonaite sera ee ara ee ocr nse C2) Vee Se hy) 1.68 3.07 
Cal ciumaksulp Maton eee n ne eer een Der )s te ine ale Rte hE 89.42 83.55 
NAY ERLPSIE Gia ilerane dete hee Bis oe iis Sia ie AU UI OR SP ata 6.82 6.67 
HOt] Sark ey eee Ne MR DRI NC LC rene ey) TM eZ Ad 100.50 99.50 
In the following, No. 1 is ‘“‘Acme’’; No. 2 is ‘‘Sunshine,’’ a 
finishing material manufactured by the Great Western Plaster 
Company, of Blue Rapids : 
90. This and other analyses of this series were made by B. and McF. 
