282 MAGNESIAN EARTH. 



With lofs of one An hundred parts of this earth treated in this manner, until 



the boiling ceafes, after an hour of incondefcence, became re* 



duced to 85, and 0,40.. The earth calcined in this manner 



throws out that blueifh light which has been obferved from 



common magnefia. 

 Giving out car- If the calcination is made in a retort of earthen ware, to 

 Jxmic acid. which a (yphon is adapted, and plunged into a bottle 61Ied 



with lime water, there is formed in the bottle carbonate of 



lime; fo that the diminution of weight is partly due to thedii* 



engagement of carbonic acid. 

 & contains a A thoufand grains of this earth in fine powder were boiled 



S'fulDhlteof^ ]U flX P ounds of diftilfed water. The liquor being filtered, 

 lime. * ? nti then eifayed by various reagents, prefented the following 



refulK 



With the folutions of the acetate, nitrate, and muriate of 



barytes, the mixture became troubled almoft inflantly, and 



formed a fediment of fulphate of barytes, but in a very fmall 



quantity, 



The oxalate of ammonia formed oxalate of lime with it, 



but alfo in a very fmall portion. 



Thefe experiments repeated different times, on the earth, 



fcotji of the ftony and friable varieties, conftantly gave thq 



fame refults. 



{Jme and fulphuric acid, or fulphate of lime, is therefore, 



although in a fmall degree, a conftituent part of the earth o£ 



Baudiflero both in the ftony and Toft ftate. 

 A minute por* The nitrate of filver formed a precipitate equally with both 

 tion of muriatic forts; but remarkable differences were obferved between its 



m&ntfnthe* *&&* in the vyaler ftom th ^ ft ° n ? ^P ecies '- and on ihdt irom 



ftony variety, the foft variety ; with the latter it formed a precipitate, which 

 collected in a powder at the bottom of the gl^fs ; but with 

 the water from the ftony kind, betides the precipitate, 6Ia- ? 

 ments were produced conftantjy, which indicated the prefence 

 of muriatic acid. Many times the " fuiphuric acid*" wa$ 

 flrft removed by the acetate of barytes, and after filtration, or* 

 being treated with the nitrate of filver, (till formed a precipe 

 tate of muriate of filver. 



* It is not clear what the removal of the fulp/iuric acidmenUor\ei\ 

 here had to do with making the appearance of the muriate of filver 

 fecm extraordinary ; perhaps it is an error iathe original ; the trah-& 

 l6t&n is literal and correct. B. 



3 Th* 



