YTTHIA. 



Carbonic acid 30-019 or 2-75 



Yttria . 5?'700 - 5-28^ 



Water . 12-281 - 1-125 



100-000 



This brings the atomic weight of yttria to 5 '285, 

 a number which must come pretty near the 

 truth. 



2. Berzelius dissolved 2*8 parts of pure yttria OF sulphate 



. ' . of yttria. 



in sulphuric acid evaporated the solution to 

 dryness and heated the residual sulphate till it 

 ceased to give out acid vapours. It now weighed 

 5'392 parts. From this experiment he con- 

 cluded, that anhydrous sulphate of yttria is com- 

 posed of 



Sulphuric acid 2-592 or 5 

 Yttria 2-8 - 5-4012 



5-392* 



By this experiment the atomic weight of yttria 

 comes out 5*4012. But we have no satisfactory 

 evidence that the salt was neutral, except that it 

 was still soluble in water. I am disposed to 

 think that a very small portion of the acid had 

 been driven off: for if we suppose the constitu- 

 ents of the salt to have been 



Sulphuric acid 2-685 

 Yttria . . 2-8 



5-485 

 * Annals of Philosophy, 111. 359. 



