43 111.-Analysis of the Saline Water of Purton near Swindon North Wilts. BY HENRY PhD. F.R.S. and (2.8. M. NOAD THEwater rises in a field on the Oxford Clay which reaches from the bottom of the hill on which the village of Purton is built to the river Thames at Cricklade a distance of about three miles the spring being about midway between both. The soil of Purton rests on the limestone The field in which the spring rises has long been known in the neighhourhood as ‘ISalt’s Hole.” The medicinal properties of the water are held in high esteem by the inhabitants of Purton and the proprietor has recently erected a pump-room round the well from which about 120 gallons of the water can be pumped up daily. The water which was analysed at the request of Dr.Kinneir of Purton was collected by myself in the month of January in the present year. As pumped up from the well it was quite clear and remained so after long standing. While the pump was in action a faint but decided smell of sulphuretted hydrogen was perceptible but the water itself while still had no such odour. The temperature of the water was nearly the same as that of the air Specific gravity at 60°F. = 19056. Free carbonic acid 50 cubic inches per imperial gallon the water being slowly pumped up from the well. The analysis was performed in thee usual manner the iodine which could be distinctly recognised in one pint of the water being estimated as protiodide of palladium. In the arrangement of the results of analysis the strongest acid is assumed to be combined with the strongest base ; and the lime and magnesia thrown down as carbonates by boiling are considered its existing in the water as carbonates held in solution by carbonic acid.Direct results of analysis calculated to 1 imperial pint. BASES. Experiment. Lime. Magnesia. A1kaline Chlorides. Potassium. Chloride of Sodium. Chloride of --__I--- I... .. . .. 6.422 4143 18.90 1-179 17’721 11. .. .. .. .. 6.257 4,783 19-33 1‘020 18.310 Mean ,. .. 6.340 4.765 19.10 1.009 18.016 ANA1,YSIS OF THE ACIDS (or etemelats replacing them). Carbonic Acid RS Experi-ment. SulphuricAcid. *lo-fine. Iodine with traces of Bromine. Carbonic Acid free and combined. Carbonate of Lime and Carbonate Car-bonic Acid,free.Phos-phoricAcid. APO:crenic Acid. nesia. of Mag- - I,. .. 11,. .. 2-38 2-36 >? I ” I ” Mean 2.37 3.133 - VER~FICATIONLIME. FOR Lime precipitated Lime left in solution Experiment. boi% g. boiling. ---____. I. .......... 2.828 11. .......... 2.857 .--Mean ........ 2-842 VERIFICATION MAGNESIA. FOR Mawwsia Mawesia Total Total Experiment. preciphtcd by leR in --.-*----boiling. solution. I .......... 0.11 1 4-735 4.845 4.748 I1 .......... 0.15 4.785 4.945 4.783 Mean ........ 0.1 3 4.755 4.890 4.765 BALlNE WATER OF PURTON BY DK. KOAD. RESIDUELEFT ON EVAPORATION. Experiment. Mineral Residue. Organic Residue. Total Residue. --I_- -I_- I ............ 51.02 0.114 51-114 I1 ............ 51.21 o*no 51,320 --___.---- Mean ..........51-11 0.112 51-217 Solid Contents of an imperial pint as determined by analysis. Carbonate of lime . . 5.0760 Carbonate of magnesia . . 0.2630 Lime (not as carbonate) . . 3.2200 Magnesia (not as carbonate) . . 4.7580 Potash . . 0.6930 Soda . . 9*5460 Chlorine . 2*8100 Sulphuric acid . . 23*9000 Silica . . 0*2800 Phosphoric acid . . 0.0310 Bromine . traces Iodine . . 0.0094 Crenic acid . . traces Ayocrenic acid . . 0.1120 50.6989 Residue left on Evaporation . . lil*Zl70 Saline Constituents in one lmperial Gallon. Carbonate of lime . . 40.608 Carbonate of magnesia . . 2.104 Sulphate of potash . . . 10.264 Sulphate of soda . . 174.904 Sulphate of lime . . 62.560 Sulphate of magnesia . . 76.592 Chloride of magnesium . . 30*000 46 VOELCKER ON THE COMPOSITION Iodide of sodium . . 0*088 Silica . . Z0080 Phosphoric acid . . 0.248 Crenic acid . . traces Apocrenic acid . . 0,896 Bromine . . traces 400.344