384 



DR. W. M. HTCKS: A CRITICAL STUDY OF SPECTRAL SERIES. 



(6) 18061-87 

 100-20 



Sr (6)1804471 59'69 (8) 18104'40 57'67 (10) 18162'07 



56-61 



(8) 18218T>8 



(10) 18968-53 

 21-57 

 Ca (8) 18985-31 4'79 (6) 18990'10 7'15 (6) 18997'25 



14-01 

 (4) 19004'H 



(10) 19016-64 

 100-34 



Sr (10)19083-27 33'71 (8) 19116'98 15'25 (8) 19132'23 10'70 (8)19142-93 



59-75 



(4) 1917673 



The first lines of the triplets give as denominators, supposing the true limits to 



1st triplet 

 2nd 



Ca. 



3'145123(22)-141-8 

 3-317300 (30)-166'4f 



172177 + 30p-22g-24'6 



Sr. 



3-388848 (28)-177'4 

 3-572008 (23)-207'8 



= 33 



= 126 (136878- '20)-5c5 



where p, q lie between 1. Clearly the differences are the multiples 126A 2 , 33A 2 , 

 for the two elements respectively. 



The first lines of the doublets give for Ca 3*150824 (22)- 142"6 and for 

 Sr 3-420693 (18)-182'5 



These differ from the denominator of F n (3) by 



769567 + 123j9-22g-132'6^= 562 (l369'33 + '22p--04g- -236^) 



= 88 



Ca. 



Sr . 



That is, they apparently differ by 562A 2 , 88A 2 respectively. We shall see shortly 

 that the best value for makes the relation for Sr very exact, whilst that for Ca is 

 more doubtful. 



