424 PHILOSOPHICAL TRANSACTIONS. [ANNO 1798. 



effect. 6. Muriate of barytes caused a slight precipitate. 7. Ammonia, pot-ash, 

 and oxalic acid, severally produced precipitates, when added to different portions of 

 this water. 



Analysis. — a. 300 cubic inches of the water, by a gentle evaporation, left a pale brown scaly sub- 

 stance, which weighed 58 gr. b. These 58 gr. were digested in alcohol, without heat, during 24 hours, 

 and afforded a solution, which, by evaporation, yielded muriate of lime, slighdy tinged by marshy ex- 

 tract, 18 gr. c. 6 oz. of distilled water were then poured on the residuum, and, with repeated stirring, 

 remained during 24 hours. By evaporation this afforded muriate of soda, with a very small portion of 

 sulphate of soda; in all, 10 gr. d. What remained was boiled in 800 parts of distilled water j and the 

 solution, being evaporated, left of selenite 1.70 gr. e. The undissolved portion now weighed 25 gr., 

 and was digested with diluted muriatic acid : a great part was dissolved, with much effervescence, and, 

 being filtrated, afforded, by ammonia, of alumina 1.50 gr. From this I afterwards separated a very 

 minute quantity of iron, by means of prussiate of pot-ash. f. Carbonate of soda was then added to the 

 liquor, and precipitated carbonate of lime 21 gr. a. The insoluble residuum weighed 3.50 gr.j and 

 proved to be principally carbon, produced by decomposed vegetable matter, with a very small quantity 

 of siliceous earth. The result of this analysis was, therefore, Grains. 



b. Muriate of lime 18 



c. Muriate of soda, with a very small portion of sulphate of soda 10 



d. Selenite X 70 



e. Alumina, with a portion of iron too small to be estimated 1 50 



f. Carbonate of lime 21 



6. Carbon, with a littie siliceous earth 3 50 



55 70 

 Loss 2 30 



58 



It is worthy of notice, that the iron present was in so very small a quantity, as 

 not to be detected by any test, till it had been separated in conjunction with the 

 alumina. • 



The water N° 5, from Mr. Wiseman's account, does not appear to have been 

 concerned in producing the effects which he has observed, and the quantity was too 

 small to be subjected to a regular analysis, I noted however what follows: 1. It 

 has a very strong hepatic flavour and smell. 1. A plate of polished silver, put into 

 it, became black in a few hours. 3. It became faintly bluish with prussiate of pot- 

 ash, after standing 5 or 6 hours. 4. Tincture of galls produced a faint purple 

 cloud. 5. Solution of acetite of lead afforded a brown precipitate. 6. Nitrate of 

 silver produced the same. 7- Pot-ash, and ammonia, caused a precipitate; but 

 that of the former was the most copious. 8. Oxalic acid produced a precipitate. 

 9. Muriate of barytes had also a slight effect. The water N° 5 cannot therefore 

 be considered as a chalybeate, the quantity of iron contained in it being scarcely 

 perceptible; but it appears to be a water containing some hepatic gas, together with 

 substances similar to those contained in N° 1. 



From the above experiments it is evident, that the water N° 1 does not contain 

 any of the component parts of the crust formed on the copper wire and cuttings, 

 though it is certain that the incrustation took place during the immersion of those 



