1874.] Mr. J. N. Lockyer's Spectroscopic Notes. No. III. 377 



the light being transmitted in the centre of the spectrum 

 (as by gold-leaf). 



(3) Continuous absorption clinging on one side or other of 

 the line. (This phenomenon, which, so far as I know, 

 is quite new, will be described in another note.) 

 (e) The new spectrum. 



Na. I have observed, either separately or together : 

 (a) D absorbed. 



(/3) Continuous absorption throughout the whole spectrum, 

 (y) Continuous absorption clinging on one side or the other 



of D. 



(3) The new spectrum. 



Zn. Continuous absorption in the blue. (An unknown line some- 

 times appears in the green, but certainly no line of Zn.) 

 Cd. Continuous absorption in the blue. 

 Sb. New spectrum, with channelled spaces and absorption in the 



blue. 



P. The same. (This, however, in consequence of the extreme deli- 

 cacy of the spectrum, requires confirmation.) 

 S. Channelled-space spectrum (previously observed by Salet). 

 As. Probable channelled-space spectrum. (Observations to be re- 

 peated.) 



Bi. No absorption. 



I. Channelled spectrum in the green and intense bank of general 

 absorption in the violet, where at the ordinary temperature 

 the vapour transmits light. 

 Hg. No absorption. 

 10. These results may be tabulated as follows : 



y j Modern 



' ' atomic weight. 



H . . . . 1 1 No visible absorption. 



K .... 39 39 Line absorption. 



As .... 150 75 Probable channelled-space absorption. 



Cd .... 56 112 Continuous absorption in the blue. 



I .... 127 127 Channelled-space absorption + band of 



absorption in violet. 



Hg 100 200 No absorption. 



N .... 14 14 



P .... 62 31 Channelled-space spectrum probable. 



Na ....(?) 23 Line absorption. 



Zn . . . . (?) 65 Continuous absorption in the violet. 



Sb ....(?) 122 Channelled-space spectrum and absorption 



in the blue. 



S .... 32 32 Channelled-space spectrum. 



Bi . f . . (?) 208 No absorption. 



22 



