208 W. Gibbs on the wave lengths 
TaBLE IX (continued). 
NICKEL. ms i K ‘ ‘ 
A 
= bis 0 " 1633-1 51956 1 1303-4 55060 2 77 50454 
10293 BSBST (3c) LZSS SIZIS 1 | 1489-2 530-60 5 989-2 59245 
13248 B48-i7 (4a) , 10eT5 50845 2 16223 51962 1 980% 59238 
643 51808 tbs Be at 1623-3 51955 1 993-1 592-77 
17273 512-05 (3b) DipyMromM. 1940-2 497 ¢ 1 10058 589°60 
1748-9 48 (Be) : (19886 493° b) 1 1008°3 58917 
1749 51043 2a) 2225 55983 2 7 19895 493 73 j 10092 589-02 
1775'S BOS'ST (Bb) , L280, 55922 1 — 20038 49256 2 10105  583°81 
76°35 508-52 (Be 13645 bigest 2 2004-7 49249 2 1013°9 58826 
18422 504-02 (4b) (18652 544: 2081 49025 2 10151 58807 
1868-4 50225 (5b) 1431-9 i644 1. 906 49 2 1016-4 58786 
1920°2 498-76 (4b 1471-1 532-42 i 21214 483 1 1017°7 
1995°8 ; 4b} rear Bet 2208:2 +70 2 10182 58757 
19875 493-87 £50) ABLO-4 52771 22145 47487 2 
9008'1 19(1b) 1586 52624 1 22178 47457 2 PALLADIUM. 
2025-7 49059 (4a) Slt 52579 1 26462 443°39 K-39 
20647 487-66 (2c 1548-9 5251 41147 57436 1 
20735 487-03 (3 : 15675 523-79 1 ATMOSPHERIC 11 94 2 
30869 485-97 (aby 17092 1335 2 11649 56742 2 
21127 483°82 (3b) h 11856 56466 1 
2115 483:56 (ga) LANTHANUM. 711-4 65213 12646 55510 2 
M4 479-16 (4a) 44% A 30:27 1269 5458 2 
21992 476-21 (3a) ii ane Seat? 949-4 599-99 1279-1 55339 1 
22497 471-26 (6a) ek 538°43 949-°8 599-91 1400 eid 
405-31 (24) car 8 —e 2 951-7 599° 407 539°06 
Pree : re 53448 1 9542 599-05 1430-1 53662 1 
K os - ; 2 958° 598-15 14470 53480 1 
11001 56815 1 163E8 BIRGD 2 wore Bey ard Be 
1240-9 556% 1 B1808 ASESD 1 eee Soe 14053 OE 
12567 55603 1 guia : et 
1329°1 54765 2 LANTHANUM AND ee es | oot’ ae 
18382°4 54727 2 DipyMiv on peel 3 ba 
‘S062 bane 1 : M. 968°7 596-22 1601-4 52121 
13850 54140 2 1025 58652 1 pe oe { t660 2680 5 
4401-7 530-62 2 10645 58097 1 9708 Bona 100 Eee 
1438-9 535-72 3 1 580-72 a 1703. ae 
mo be346 1 10711 58006 1 OE Ie tG ent pe 2 
Pe © a a wo at 
jug maj. ie font vere) Oe ee : 
or 4 fj of 62 fi af 
1724 52343 | 10921 57733 2 9641 504.88 
2 it is important to be able to judge of the probable error 
in the determination of each of ibese ii ines, I reprint, for the : 
ob of convenience, the table of data employed and differences — 
obtained given in i ob per on the determination of wave 
hs by ee: Lise cg comparison, In this reprint, two OF 
ee sett: i. 
I have already o Pain to the very lar robable— 2 
error (£066) in the tenth nth group of observations aiscuseh. 4 
hat it may not be supposed that I have too hastily adopted a 
straight line as most nearly representing the data assumed, 
_ will here give the successive orders of differences correspon 
endear s of the 2d, 3d, 4th and 5th degrees, w which I 
ored to draw though the sime points 
