1878. ] 299 [Chase. 
Zinc, K H. 
Wave-lengths. Quotients. Theoretical. / 
636.99 637.37 1.0000 1.0000 1.0000 1 
610.64 610.89 1.0482 1.0442 1.0890 1+ua 
‘589.90 589.90 1.0798 1.0805 1.0781 1424 
472.25 471.98 1.8488 1.3504 1.35138 14+ 94 
Capmium, K H. 
Wave-lengths. Quotients. Theoretical. 
647.22 647.08 1.0000 1.0000 1.0000 1 
644,59 1.0041 1.0041 1+ a = 28 
531.27 531.01 1.2182 1.2186 1.2300 14+ 2a 
509.00 508.88 1.2715 1.2717 1.2727 1+56 
480.56 480.27 1.3468 1.3473 1.3450 1+ 34 
468.10 1.8826 1.3818 1+ 70) 
441.94 441.81 1.4645 1.4646 1.4600 1+ 44 
The quotient of Kirchhoff’s sixth wave-length by the seventh (468.10 
+ 441.94), is equal to the quotient of the fourth by the fifth (509 ~ 
480.56 — 1.0592). The harmonic denominators, 1+ 7¢,1-+ 11¢,1+4 
15 c—if ¢ = 311.6—give 1.2181, 1.3428, 1.4674 ; but this is not so satisfactory 
a representation, on the whole, as the one I have adopted. (24+ 3-+ 4) a 
= (5+ 2x7) d. 
LANTHANUM, K. 
Wave-lengths. Quotients. Theoretical. 
538.56 1.0000 1.0000 1 
538.43 ; 1.0003 1.0003 1 era 
538.00 1.0011 1.0011 1+a 
534.48 1.0077 1.0077 1+ 74a 
520.80 1.0541 1.0340 1+ 3la 
519.20 1.0373 1.0373 1+ 34a 
518.69 1.0885 1.0384 1+ 35a 
481.59 1.1188 1.1188 1+ 108 @ 
Soprum, H. 
Wave-lengths. Quotients. Theoretical. 
616.74 1.0000 1.0000 1 
616.56 1.0002 
590.04 1.0452 1.0455 1+6a 6=1-45) 
589.435 1.0462 
569.46 1.0830 1.0835 1+iladl=142~x 5) 
568.90 1.0840 
615.90 1.1954 
515.37 1.1966 1.19738 1+ 26a (26=1+5 x 5) 
498.87 1.2362 1.2862 1+ 31a (31=1-+6 ~x 5) 
