IIS 



5:h method. 



6th method. 



7th methed. 



rrussiate of 

 potash does 

 not ascertain 

 the quantity 

 of iron. 



ALUMIKOOS CHALYBEATE SPRIUS IK I. OF WIGHT 



5th method. After having obtained by the preceding 

 method? a knowledge of the proportions of iron and earthy 

 substances. and formed an estimate of the nature and quan- 

 tities of acids with which they are united, to ascertain in a 

 direct manner the quantities of acid» by their rebpective 

 reagents, with a view to obtain a confirmation of the pre- 

 ceding results. 



6th method. To boil a known quantity of the water in 

 succinate of ammonia, till all the iron and a/vmine are pre- 

 cipitated—edulcorate, precipitate and separate the alumine 

 from the iron by boiling in caustic potash. From the clear 

 concentrated fluid, to separate the lime by oxalate of am- 

 monia, and the magnesia by pure ammonia; to evaporate 

 the remaining clear fluid to dryness, and to apply a red heat, 

 in order to burn or volatilize any remaining portions of the 

 tests used in the processes above described. To rtdissolve 

 the residue in order to ascertain by subsequent evaporation 

 the presence and quantity of sulphate and muriate of soda*. 



7th method. To boil a known quantity of residue of the 

 wa f er in alcohol, in order to ascertain what salts it may con- 

 tain, which are soluble in this menstruum. 



Although I found it expedient, before advancing farther 

 in the examination of the water, and in order to regulate 

 my steps in the progress of the inquiry, thus to trace the 

 various plans which seemed adapted to the purpose, yet I 

 apprehend it would be superfluous to detail here in regular 

 succession all the trials, which arose from these different me- 

 thods. I shall therefore confine myself to such as belong 

 more immediately to my object ; and in relating them, shaH 

 consider singly, and under separate heads, the various ingre- 

 dients of the water, stating, as I proceed, the proportions 

 in which they were ultimately obtained. 



Sect. VIII. Sulphate of iron. 



The presence of fron, in the state of sulphate, having 

 been abundantly proved by the preliminary experiments, the 

 next step was, to ascertain the proportion of this salt in a 

 given quantity of the water. The first reagent which I tried 



* This process is liable to an objection, which wili be hereafter fully 

 stated, namely, that muriate of soda is decomposed by sulphate of 

 ammonia at a high tempi rature. 



fot 



