262 Proceedings of the Royal Society of Victoria. 

 Lithium. The three equations, expressing the 3 series, are : 



1.8*97+ 15 °" =X- 



?r — 5-88o 



1 QJ.Ofi 



2. 3497+ , ^ =A» 



n- - 3 -bo 



3. 2297+ , 5 ^„ =X" 



« a - 2-6535 



The line 3838 does not agree closely, but fits exactly into a 



Banner formula, viz., A" = 3731 x " . the head-line of which 



n 1 — 4 



is 6708. The series, however, is not continuous. 

 Sodium is represented by 6 equations, viz. : 



1. «7M + _»1» i" 



;r - boo 



2 . 4072 + -?»" -X- 



n — b-ob 



3. 4085 + .. 18 fL = A " 



;r- 4-532 



4. 4082-5+ , 183 A 3 =X» 



rr - 4-532 



5. 2416-7+ a 59 ^ A1 =X" 



n - 2201 



6. 2416-7+ a 59 3 ^ m =X w 



«" - 2-201 



The two lines 5676 and 5670 are omitted as most likely 

 belonging to a foreign metal, perhaps Titanium. 

 Potassium likewise furnishes 6 equations : 

 , ,„„„.«. 18865 =x „ 



= \ n 

 = \" 

 = \» 

 = X» 



33 = A " 



