383 



KEroiiT — 1884. 



The following lines between the wave-lengths 3900 and 4000 have been observed 

 by Lockyer in the arc-spectrum of Didymium, 3994-0, 3985-5, 3978-8, 3975-8, 3972-4, 

 3964-6, 3963-9, 3903-3,3962-9,3962-1, 3961-3, 39011, 39570, 39509, 39501, 39405, 

 3937-9, 3926- 1, 3920-1, 3918-1, 3917-0, 3910-4, 3907-8, 3905:!, 3901-3. 



Erbium. 



Spark 



Spectrum Intensity 



I and 



„„ ,, Character 

 llialen 



Spark 

 Spectrum 



Thalen 



Spark 



Intensity Spectrum 



and 



Character I ™, . , 

 Thalen 



Intensity 



and 

 Character 



57320 

 50260 

 5485-0 

 5450-0 

 5343-5 

 52560 

 5217-0 

 5188-0 

 51040 

 51330 

 50700 



5041-5 

 4951-0 

 4899-0 

 4871-5 

 48300 

 4819-0 

 4794-5 

 47020 

 47580 

 47500 

 4078-0 



Spark 

 Spectrum I Intensity 

 and 



„,, , . Character 

 Thalen 



40740 

 4606-5 



4505'5 

 4502-5 

 4552-5 

 4500-6 



HTl'5 

 4458-5 

 4419 

 4409-0 

 43260 



8 

 8 

 1 

 2 



2 

 6 

 1 

 2n 



4 



Fluorine. 



Gallium. 



