MINERAL WATERS OF DUNBLANE. 465 



6. Lime water had no sensible effect. 



7. Ammonia, when perfectly free from carbonic acid, caused 



no turbid appearance. 



8. Oxalate of ammonia produced an abundant precipita- 



tion. 



9. Tincture of galls, added in a very minute quantity, did 



not immediately produce any effect, but after a few 

 hours, a dark colour appeared, which gradually deep- 

 ened, inclining to an olive-green. 



With all these tests, the general results are the same as those 

 from the operation of the same tests on the Dunblane water. 

 In experiment 7th, the ammonia, if not perfectly free from 

 carbonic acid, produced a slight turbid appearance, and even 

 when in its purest state, a very slight opalescent hue was per- 

 haps apparent ; but this obviously depended on the presence 

 of a little carbonic acid ; for when a drop or two of nitric acid 

 was previously added, and the water heated, no such appear- 

 ance was produced ; or, if boiled strongly, without any addi- 

 tion of acid, on restoring the original quantity of liquid, by 

 adding distilled water, the transparency was not in the slight- 

 est degree altered on adding pure ammonia. The slight pre- 

 cipitate, too, which did occur in any case, was dissolved by the 

 most minute quantity of muriatic acid with effervescence ; and 

 this solution became turbid on adding oxalate of ammonia, 

 proving the precipitate to have been carbonate of lime. 



The same general conclusions, then, with regard to the na- 

 ture of the ingredients, are to be drawn from the preceding 

 results as from the application of the same tests to the Dun- 

 blane water. They suggest of course a similar mode of ana- 

 lysis. I preferred the second of the methods above described^, 

 as being the most simple, and easy of execution. 



An 



