146 
common salt. The following is the analysis made by Mr. 
Gatehouse, the City Analyst, November 11, 1894 :— 
“Tora, SOLIDS ON EVAPORATION 53°12 GRAINS PER GALLON, 
CONSISTING OF— 
Water of hydration ... oe Ye 
Chlorine 11:9 calculated as Sodium chloride 19°50 
Nitric acid -7 calculated as Sodium nitrate 96 
Sulphate of lime 1 ae . 13D 
Carbonate of lime sat nae woe . 9702 
Silica a AiG an 30 14 
Magnesia... ise a ae "92 
Oxide of iron Rid a se 40 
Alumina ... yA +e wee |) 2500 
52°54 
Loss and not estimated as xe 58 
53°12 
P.S.—From a consideration of these figures taken in connection 
with the section of the well sent with the water, I think it highly 
probable that the bulk of the water is derived from the saliferous 
Marls . . . . which usually are more or less impregnated with 
Salt and Gypsum. 
Temporary hardness ... a édhcs saat 
Permanent hardness ... Gi ue Oe 
Total hardness gs me <-.) LOGE 
The temporary hardness is due to the carbonate of lime and 
similar bodies, thrown down by boiling ; the permanent hardness 
is chiefly due to the soluble Calcium sulphate not thrown down 
except on very prolonged boiling, and then only incompletely.” 
