37Q SIR WILLIAM CROOKES ON SCANDIUM. 



Analysis, 



(1) 9-003 gr. of scandium mono-chloroacetate left on ignition 2*193 gr. of scandia, 



= 1 -4202 gr. of scandium. 



(2) 15'145 gr. of mono-chloroacetate left on ignition 3'634 gr. of scandia, 



= 2'3530 gr. of scandium. 



(3) 14-099 gr. of mono-chloroacetate left on ignition 3*387 gr. of scandia, 



= 2'1934 gr. of scandium. 



Theory. Experiment. 



284-09 100-00 100-00 100*00 lOO'OO 



The scandia from these analyses showed when spectrographed no trace of extraneous 

 lines. The earth from the filtrate showed a little yttrium and ytterbium. 



SCANDIUM LACTATK, 

 { CH rj 1 



; CHOH ; SC+<;H,,O. 

 I ooo j , 



On mixing hot solutions of scandium nitrate and ammonium lactate, the scandium 

 salt on cooling separates in white feathery crystals, slightly soluble in cold, and more 

 soluble in hot water. It is easily soluble in ammonia ; on evaporating the ammoniacal 

 solution crystals are deposited which are double refracting, showing colours in 

 polarised light. Dried over sulphuric acid the crystals of scandium lactate contain 

 six molecules of water, four of which are driven off at 110. 



Analysis. 



(1) 4-571 gr. of the 6-hydrate scandium lactate left on ignition 0747 gr. of 



scandia, = 0'4837 gr. of scandium. 



(2) 3*379 gr. of the 6-hydrate scandium lactate left on ignition 0'561 gr. of 



scandia, = 0'3633 gr. of scandium, 



