MoREOW — Spectra of Manganese, Lead, Copper, and Lithium. 285 



Lithium. 



The standard solution of lithium chloride was made by dissolving 

 5'279 grammes of pure lithium carbonate in hydrochloric acid, and diluting 

 to 1 litre with distilled water. 



When passing the current for the first time, there was a strong yellow 

 coloration in the tube until nitrogen leaked in through the mercury trap, 

 which gave the usual mauve tint. Whilst taking the second photograph 

 there was a persistent yellow colour in the tube, which had almost disappeared 

 when taking the third photograph. 



Not many lines of lithium appear on any of the photographs, as it is 

 evidently not very volatile, but the ultimate lines are A 6708'2 and X 4602'4, 

 which are seen on Plate XXIV., No. II. In No. Ill there is an exceedingly 

 faint indication of A 6708 '2 on the original plate. 



The sodium lines A 5890'2 and A 5896-2 appear as one line on all three 

 photographs, showing the greater volatility of sodium than of lithium. 



SCnSNT. PKOC. R.D.S., VOL. XIII., NO. XXII. 



2 X 



