OF SCHOOLEY'S MOUNTAIN". 513 



A water holding sulphate of iron deposites an ochre by absorption of 

 oxygen ; but if it contain a carbonate of iron, the precipitate is owing 

 to the separation of carbonic acid. The carbonated chalybeate s are 

 by far the most numerous ; indeed, any others are extremely rare. 



It would appear by (c.) that the water from the spring does not 

 contain a free acid ; but the just inference, with regard to the absence 

 of carbonic acid, is, that the water does not contain the one eighteenth 

 of its bulk of carbonic acid gas, that amount being necessary to produce 

 the effect of reddening litmus paper. 



It appears by (d.) that there was not present a free nor carbonated 

 alkali, nor a pure earth. 



(e.) Showed the separation of some gaseous substance ; other trials 

 determined it to be carbonic gas. 



(f.) Proves the absence of every thing sulphurous. 



The result of (g.) clearly indicated the presence of lime. 



(A.) Seemed to exclude the presence of sulphuric acid, but sulphate 

 of lime, when present in only a very small proportion, is not detected, 

 with certainty, by any single test ; and, through the subsequent analysis 

 by evaporation, that substance was found to be contained in this water. 



(i.) Left no doubt of the presence of muriatic acid. 



Were it enough merely to determine the quality of this water, and 

 the nature of its ingredients, those trials might be deemed almost suffi- 

 cient ; but no chemical investigation will now be received as satisfactory, 

 which does not exhibit the exact quantity and proportion of all the 

 constituents of a compound. To do this, further experiments were 

 necessary ; and if in the detail of these I shall appear to bestow on 

 small matters a disproportionate attention, it will be recollected that 

 exactness is indispensable. Should any error occur in my process, by 

 being minute, I furnish the greater facility of detecting it to those who 



