of the Spectral lines of the Elements, 217 
numbers corresponding to equal intervals expressed in wave 
lengths, and is based upon Angstrém’s measurements alone. 
For the sake of completeness, I give this table in full, together 
with the wave lengths for the same lines, as found by myself 
by Cauchy’s method of interpolation, and the differences. For 
the sake of comparison I have changed the position of the de- 
cimal point in the wave lengths determined by Mr. Stoney, so 
as to correspond with my own results. 
Taste XIII. 
3 SA A A d A 
T7191! 650 65014 = —14 15279 527 62694 +06 
7585? 640 64092 —22 15402 26 62588  +:12 
0 # 630 68039 —39 15528 525 +13 
8455 «62 620-71 —T71 156 524 +04 
855 619 61854 +46 15783. 623. 622-97 +03 
8606 617 61742 —42 1591-2 «-522,s«d20L = — 0 
8657 616 61650 —-60 1604°3 B21 20-99 01 
8109 615 = 61540 —40 16175 520 51998 +-02 
Si6l «614. 614-44 4 16308 519 61899 +01 
4 Sere. 618 61346. —46 16443 618 51799 +01 
8866 612 861244 - —44 16583 517 51697 +03 
8919 611 = 611-48 — 48 1673 516 «61592 +008 
8972 610 F488 1762 % 510 09°52 8=+°48 
948 ? 600 60026 —-26 1913 ? 600 49930 +°70 
0 5 59007 —07 19508 49 49637 +13 
0097 «5 589-00 “00 1962°5 96 
070 ? 580 58020 —20 19743 495 «=: 495-05 ss —"05 
es 510-25 = —-25 1986-1 494 49407 —07 
1993 668 56298  +.02 1998 493 49306 —06 
2074 5621-98 $02 20102 492 49201 —O1 
2156 =§=6561 = 560-97 +08 20226 491 49095 +:05 
2238 660 55997 +:03 203852 490 48991 +09 
232 559 «65898 =. +- 02 20479 489 48889 +°11 
1240-2 558 558-00 20608 48 487-95 +°05 
1484 557 57-01 eO] 20787 487 487038  —03 
309 550 4666018 —13 20867 486 48715 —l 
13347544547 00 20998 485 48504 —O4 
13433 546546 00 2164 479°34 6 
521 545 45-01 — 01 99995% 470 46825 +1°75 
612 544544 00 2492 2 59-12 88 
13705 = 54354997 «408 265382? 450 44972% +-28 
13797 54284197 = $08 26515 443 
541 640-98 Ss 02 26676 442 44208 —03 
13983 540 -589:98 +02 ny 41° MI. OF 
4077-539 53898 = +02 26996 440 44 0 
M172 53853796 = +04 B7157 «9439. «43907 «= — 07 
14266 ©6537 53698 = +02 275 8795 +05 
M361 536 «= «4536-01 —0l 27488 487  436°89 +11 
M456 536 «© 58614 — 414 2766 36 43595 +°05 
M544 5. 534 —138 27884 485 43517 —17T 
464583 8-14 «= 14 «Ss BOL )= 484 48446 | 46 
4137 = 530 gge16 | 15 2319 48 TT 
1483-8 531 581s © « 13 2887 432 432° —90 
N04) 539s 3019 — 12 2855 431 43159 —59 
15048 5529S 52912 "12 2873-1 430 8 +13 
15161 52802 
528 —02 : 3 
AM. Jour. Sc.—Sgconp Serres, Vou. XLVII, No. 140.—Mancu, 1869. 
. 15 
