called the Gadoli?ihe. 373 



.3d, It is not fufible alone, but with borax it forms a white 

 glafs, which is tranfparent when it has not been added in 

 excefs. 



4th, It is not fenfibly foluble in cauftic fixed alkalies : in 

 this it is different from alumine and glucina, which combine 

 with thefe very eafily and in large quantity. 



5th, It is foluble in the carbonat of ammonia, but five or 

 fix times lefs fo than glucina ; that is to fay, five or fix times 

 more carbonat of ammonia is required to diffolve an equal 

 quantity of yttria. 



6th, It combines rapidly with the fulphuric acid, and pro- 

 duces heat in proportion as the union is effected : the fait 

 thence refulting cryftallifes in fmall brilliant grains little fo- 

 luble in water: it appeared to me that more than fifty parts 

 of cold water were neceffary to diffolve it, efpecially when 

 hot accompanied with an excefs of acid. It has a tafte at 

 firft aftringent, and afterwards fweet, like fugar or fait of lead. 

 This property, though analogous to that of glucina, is, how- 

 ever, fo fenfibly different from it, that by comparing them 

 they may be eafily diftinguifhed. 



7th, Its combination with the nitric acid has a more 

 ftriking favour, but it produces in the mouth an effecl: of 

 the fame nature : it cryftallifes only with difficulty, and its 

 affinity for water is fo great, that it requires fome trouble to 

 dry it. During this operation, if it be expofed to too much 

 heat, inftead of becoming folid, like the greater part of the 

 falls, it grows foft, and affumes the appearance of thick 

 tranfparent honey ; by cooling, it becomes hard and brittle 

 like a ftone; when expofed to the air, it attrafts the moifture' 

 of it, and becomes foft. 



The fulphuric acid, poured into a folution of the nitrat of 

 yttria, forms in it a cryftailine precipitate, which is a fulphat 

 of the fame earth- 



8th, The combination of this earth with the muriatic arid 

 exhibits nearly the fame phenomena, in the fevefal experi- 

 ments I made, as the nitrat above examined : like the nitral 

 it can be dried with difficulty, it is fufible by a gentle heat, 

 and ftrongly attracis the moifture of the atmofphere. 



9th, Ammonia precipitates yttria earth horn the three 

 Vol. VIII. 3 C cum- 



