296 Prof. P. E. Chase on Undulation. 



Mercury, KH. 



Wave-lengths. Quotients. Theoretical. 



568-47 568-55 1-0000 1-0000 1*0000 1 



546-33 546-13 1-0407 1-0411 1-0406 l + 6a 



542-80 542-80 1-0473 1-0484 1-0474 l + 7a 



Lead, KH. 



561-29 561-46 1-0000 1-0000 1-0000 1 



537-71 537-85 1-0439 1-0439 1*0440 1+ 3a 



439-07 438-93 1-2784 1-2792 1-2784 l + 19a 



Ruthenium and Iridium, K. 



635-45 1-0000 1-0000 1 



545-44 1-1650 1-1646 l + 5a 



530-52 1-1973 1-1975 l + 6a 



Chromium, K. 



541-35 1-0000 1-0000 1 



521-20 1-0387 1-0387 1 + llla 



520-98 1-0391 1-0391 l + 112a 



520-83 1-0394 1-0394 l + 113a 



Arsenic, KH. 



617-54 617-67 1-0000 1-0000 1-0000 1 



611-69 611-67 1-0096 1-0098 1*0093 1+ a 



578-95 578-73 1-0667 1-0673 1-0650 1+ la 



533-55 533-41 1-1566 1-1580 1-1579 l + 17a 



Magnesium, K. 



518-73 1-0000 1-0000 1 



517-64 1-0021 1-0020 1+ 2a 



517-17 1-0030 1-0030 1+ 3a 



459-62 1-1286 1*1285 1+ 9Z> 



448-57 1-1564 



448-39 1-1569 1*1570 1 + 116 



Zinc, KH. 



636*99 637-37 1*0000 1-0000 1-0000 1 



610-64 610-89 1-0432 1-0442 1-0390 1+a 



589-90 589-90 1-0798 1-0805 1-0781 l + 2a 



472-25 471-98 1-3488 1-3504 1-3513 l + 9a 



