366 SIR WILLIAM CEOOKES ON SCANDIUM. 



The 26717 gr. of hydrated aurochloride treated in this manner yielded 7 '361 gr. of 

 gold, and 3'862 gr. of scandia, = 2'5009 gr. of scandium. 



Theory. Experiment. 



9-36 

 27-55 

 36-81 

 16-28") 



10-00 1 26 ' 28 



1436-94 100-00 lOO'OO 



2-HYDRATE SCANDIUM AUROCHLORIDE, 

 3ScCl 3 ,2AuCl 3 ,2H 2 O. 



During the heating at 100 there were strong indications of an arrest of drying 

 when the salt had been heated for about six days, its weight then being 20'355 gr. 

 The following analysis shows that at this stage the salt was a di-hydrate. 



Analysis. 



20'355 gr. of di-hydrate scandium aurochloride, when further heated to 100 until 

 it was anhydrous, lost O'GGO gr. of water. The residue, treated as described, 

 gave 7 - 3Gl gr. of gold and 3'862 gr. of scandia, = 2'5009 gr. of scandium 



Theory. Experiment. 



1094-63 100-100 100-00 



8-HvDRATE SCANDIUM AUROCHLORIDE, 



3ScCl 3 ,2AuCl 3 ,8H 2 O. 



Scandium aurochloride with eight molecules of water is obtained by drying in a 

 desiccator over sulphuric acid the 21 -hydrate. After about a fortnight's drying the 

 weight, which at first rapidly diminishes, becomes constant. 



