f 



Water of' a Spring on tlie Estate of' Fardel, ^c 103 



presence of alumina was inferred to be incompatible with that of 

 the earthy carbonates, neither could any be subsequently de- 

 tected. 



In this analysis, the evaporation was performed in a glass 

 flask, so as to exclude dust ; the precipitates were collected, with- 

 out the use of a filter, by decantation ; and repeated affusions of 

 distilled water, and, for the most part, transferred at last into a 

 small glass flask, of the size of a pigeon's egg (not exceeding in 

 weight from ten to fifteen grains), the weight of which, being 

 previously accurately marked, was afterwards subtracted from 

 the gross weight, and in it they were dried, heated, and weighed. 



Analysis. 



1. An English pint of the water was evaporated to dryness. 

 The remaining saline matter being heated to redness, afterwards 

 weighed one grain and thirteen-twentieths. It was blackened 

 by the heating, which indicated the presence of a little vegetable 

 matter. 



2. An Enghsh pint of this water was concentrated by evapo- 

 ration to about an ounce and a-half (a few drops of nitric acid 

 being previously added to prevent any precipitation), and the 

 sulphuric acid contained in it was precipitated by nitrate of ba- 

 rytes. The sulphate of barytes thrown down, after being heated 

 to redness, weighed three-tenths of a grain, equivalent to .10 of 

 a grain of sulphuric acid. This twice repeated gave the same 

 result. 



From the residual Uquid the muriatic acid was precipitated 

 by nitrate of silver. The chloride of silver, after fusion, weigh- 

 ed six-tenths of a grain, equivalent to .15 of a grain of muriatic 

 acid. 



This gave the same result, both in regard to the sulphuric 

 and muriatic acids, when repeated without any previous acidu- 

 lation of the water by nitric acid. This was done, as there was 

 room for suspicion that a portion of the muriatic might have 

 been expelled by the excess of that acid during the evaporation. 



3. An English pint of the water, acidulated and concentrated 

 as above, had the excess of nitric acid exactly saturated by am- 

 monia. The lime being now precipitated by oxalate of ammo- 

 nia, was converted into a sulphate, which, after being heated to 



