24 Prof. W. M. Hicks on the 



We find in tiis region several strong lines, the strongest 



o o o 



being (5)57954*22 (\ = 1725*5). This would make the com- 

 bination line pi(l) —pi(2) = 16781*28, and we find it in the 

 observed line (4)16781*73 (X,= 5957). We may, then, con- 

 olude with certainty that this allocation is correct. With 

 these given lines for m=l, 2, the formulae constants arc- 

 given by 



,, = 70642-79 + g-N/{m + r -950924- 199f - * 0217 M ~ ^ ) 



This gives for ni — o... 8, the following wave numbers 

 63590*85, 66148-38, 67542*50, 68370*55. 68906*70, 69273*06, 

 all in the ultra violet beyond the observed region. For 

 evidence as to the existence of these, it will therefore be 

 necessary to have recourse to sounding, and to testing for the 

 existence of combination lines. 



m = 3. The e link requires 46337*90. There is 



obs. (3n)46342*43+2. d\ = -*J 

 2h{l)—pi("2) requires 22417*21 and is 

 not observed. 

 m = 4. The e requires 48896*1. There is obs. 



(5)48892-82. d\= 4- *07 

 The comb, requires 24975*44. There is 



obs. (3)24977*02. 

 This combination gives 66149*96. d\ = — "03. 



jh = 5. The v requires 52608*45. There is obs. 



(2)52606*66. <a = *04 



The comb, requires 26369, and is not 

 observed. 

 m = G. The e requires 51118*2. There is obs. 



(3)51119*52. t/X=-"?»2 

 The comb, requires 27197*6. There are 

 obs. (1)27191*28, (1)27202*44, of 

 which the latter may be D 12 (6), but 

 agrees well as a combination. 

 m=7. The v requires 53972*65. Obs. (4) 53978 16. d\= - 1 

 The e requires 51654*4. Obs. (1) 51659*56. = — 1 



Both point to a common line 68911*7. 

 The comb, requires 27733*76. There is 

 obs. (2)27731*94. 

 w =8, The v requires 54339. Obs. (3) 54330*11. 

 The* requires 52020*3. Obs. (7)52018*31, 

 but the latter is too strong to be accepted 



as really related. 

 The comb, requires 28100*0. There is 

 obs. (2r) 28104* 65, which is also pos- 

 sibly D n (8). 



