120 



Mr. J. N. Lockyer. 



[Nov. 17, 



deal with feeble illumination small dispersion has been of necessity 

 employed, and to make the observations along the several lines com- 

 parable a one-prism spectroscope has been so far used throughout. 

 Hence the wave-lengths given are in all cases only approximate. 

 With this proviso the lines observed have been as follows : — 



f In bunsen — 



Mg 5183, 5172, 5167, 4586, 5201. 

 Na 5889, 5895. 

 Li 6705. 

 Tl 5349. 

 Sr 4607. 

 Ba 5534. 

 Ca 4226. 

 Mn 5395. 

 K 6950. 

 Bi 4722. 



Lines 



/ Seen on passing from the temperature of the bunsen to 

 that of the oxy-coal-gas flame — 



5700. 



5207, 5410. 



Bands . . 



Fe 



5268, 



5327, 



Cu 



5105, 



5781, 



Cr 



5202, 



5203, 



Zn 



4810, 



4911. 



Cd 



5085. 





m 



5476. 





Ti 



5128, 



5338. 



W 



5490, 



5511. 



Ag 



5208, 



5464. 



£ g 



5460. 





Ce 



5273, 



5160. 



In bunsen- 







Ca 



5535, 



6250, 



Sr 



6050. 



Ba 



5150, 



5250, 



6500, 6000. 



Seen on passing from the temperature of the bunsen to 

 that of the oxy-coal-gas flame — 

 Co 4710, 4920, 5170, 5460. 



Flutings . . < 



In bunsen — 



Mg 5000. 



Mn 5580, 5860, 6145, 5340. 



Seen on passing from the temperature of the bunsen to 

 that of the oxy-coal-gas flame — 

 Ba 6010, 6350, 6480. 

 Cr 5360, 5570, . 5800, 6040. 

 Fe 6150. 

 Cu 6050, 6130. 



Zn 5460, 5680, 4985, 5140, 5340. 



All the flutings, with the exception of magnesium, have their 

 maxima towards the blue, and shade off towards the red end of the 

 spectrum. 



