late Di/coverles in Scietice, 255 



5th, Magnejta. It unites with all the acids, and forms 

 with them falls exceedingly folable and bitter : it is not pre- 

 cipitated from its folutions by carbonat of potafh completely 

 faturated with carbonic acid, and ammonia precipitates it 

 only ir^ part: it is not at all foluble in cauftic alkalies, and 

 it has a great affinity for alumine. When pure it is of a white 

 colour, is exceedingly light, has no tafte, and is infoluble in. 

 water. 



6th, Lhne. It combines with acids, and forms with them 

 falls fometimes foluble and fometimes infoluble : it does not 

 diffolve in alkalies: it diifolves in water: its folution is ren- 

 dered turbid by the carbonic acid, but not at all fo by the ful- 

 phuric acid. It is not precipitated from its folutions by 

 ammonia, and it precipitates all the preceding earths. In 

 its ftate of purity it has an acrid cauRic tafte, becomes hot 

 with water, and a folution of it in that fluid ^oes not cryf- 

 tallife. 



7th, Strontian. It readily combines with acids, and with 

 the fulphuric acid forms a fall very little foluble : it diflblves 

 very abundantly in warm water, and its folution cryftallifes 

 on cooling in very beautiful cryftalj, which form groupes al- 

 moft like thofe offal-ammoniac. The fulphat of lime pro- 

 duces a precipitate in a folution of it: its combination with 

 the muriatic acid diftblved in alcohol burns with a purplifh 

 flame. This earth has an acrid tafte, and with" water be- 

 comes ftrongly heated. 



8th, Barytes. This earth has many properties common with 

 ftrontian, from which it cannot eafily be diftinguifhed but by 

 its being more foluble in cold water and by it? combination 

 with the muriatic acid, being only a little foluble in alcohol, 

 to the flame of which it does not communicate a purplifli 

 colour : it cryftallifes from its folution on cooling. It has 

 an acrid tafte, becomes hot with water, forms an infoluble 

 fall with the fulphuric acid, and decompofes the alkaline ful- 

 phats and carbonats as ftrontian does, but with phenomena 

 which to ihofe not much habituated to chemical labours 

 Uiffer by Imperceptible fliadcs. 



The 



