372 SIR WILLIAM CROOKES otf SCANDIUM. 



The colloidal gummy mass, smeared on a microscopic slide, dries to a clear non- 

 deliquescent glass-like substance. Exposed to dry air the film cracks and flakes off 

 like a pharmaceutical scale preparation. 



A lump of the viscid transparent mass, free from adhering water, dried in a water- 

 oven at 100, becomes white, hard, and brittle. It is now insoluble in either hot or 

 cold water, although before heating the gummy mass is easily soluble in cold water. 



The side of the beaker in which the gummy mass is precipitated by heat from the 

 solution of the malonate is seen to be studded with brilliant colourless transpai'ent 

 crystals, some measuring more than a millimetre across. 



According to the mode of preparation, scandium malonate contains either one or 

 two molecules of water. 



Dl-HYDRATE SCANDIUM MALONATE, 



(1) 35'33l gr. of di-hydrate scandium malonate left after ignition 12'282 gr. of 



scandia, = 7'9535 gr. of scandium. 



(2) 52"299 gr. of scandium malonate, dried at 120, lost 9'538 gr. of water. 



Theory. Experiment. 



(1). (2). 



22-511 



81-76 



77-49 J 



18-24 



199-156 100-00 100-00 lOO'OO 



MONO-HYDKATE SCANDIUM MALONATE, 



Analysis. 



(1) 8 "039 gr. of scandium malonate left on ignition 2 "984 gr. of scandia, = 1*9324 



gr. of scandium. 



(2) 7'876 gr. of scandium malonate left on ignition 2'958 gr. of scandia, = T9155 



gr. of scandium. 



(3) 28-281 gr. of scandium malonate left on ignition 10'537 gr. of scandia, = 6'8235 



gr. of scandium. 



