C 6 3 3 



on the water being ftirred. This foon diffolves 

 again ; cauftic calcarious earth or lime being 

 foluble in water, but by expofmg it to the air, or 

 adding a little fixed air to it, it becomes chalk, 

 and is again precipitated. 



d. Or the mild vegetable alkali being em- 

 ployed, the precipitate will not diffolve in the 

 water, but fall to the bottom, and will be found 

 to poflefs all the properties of common areated 

 calcarious earth, or chalk. 



e. So, inftead of the vegetable alkali, the fof- 

 file or volatile be employed in its cauftic ftate, 

 no precipitation is produced, lime being precipi- 

 tated ; but if the mild volatile alkali be made ufe 

 of, a white powder will be precipitated, which 

 will be found to be chalk. 



f. A folution of foap being added to this wa- 

 ter, the fame appearances will take place, as 

 when added to water containing Epfom fait. 

 The calcarious earth uniting with the oil, and 

 being precipitated, the vitriolic acid uniting 

 with the vegetable alkali. 



B. g. The acid element is difcovered by the 

 folution of muriated ponderous earth ; upon add- 

 ing this, white clouds are immediately produc- 

 ed, as defcribed (page 49) and a white infoluble 

 precipitate, which is an artificial ponderous fpar, 

 will be gradually depofited at the bottom of the 

 veffel, as defcribed (page 49) ; only here the cal- 

 carious earth remains diffolved in water in union 

 with the marine acid. 



h. Upon adding the folution of nitre of lil- 

 ver, nitre of mercury, fugar of lead, or blue 

 vitriol, to waters containing Gypfum, the fame 

 appearances take place as enumerated (page 57). 



CALCARIOUS 



