202 W. Gibbs on the wave lengths 
TaBLe IV (continued). 
MERCURY. Hs A H a Osmiva. 
H 0 4 55815 s 1240-55 561:40 s 
685 1 638-41 n 1857 4 548-96 8 5 56057 8, 6411 
697 1 20 n 1366 4 548-05 s 125927 558°24 3.d 741 7 
826 7 61546 n 1396 4 545-03 s 12811-5 556-96 s 929 7 
60963 n 1438-34 64140 s 1299 1 555°03 8s 1029 1 
1008 1-5 589°01 n 1485 4 53732 s 13031555460 n 1093 5 
587°59 n 1548-23 531°69 s 133115551'65 n 1141 1 
1060 3 582-41 n 1562 » 530°50 s 13801554663 g 1264 1 
i 074 58068 h 1658 5 52268 n 141 43°61-6* 1329 9 
108358 57951 n 1773 1 51339 n 1456 2 53986 3 1405 5 544 
1100-58 576°93 n 1909 5 50427 n 1492 5 536-71 g 1432 1-5 541°89 8 
1177 2 55 n 2191 1 48701 h 511 5 535°01 s 1683 5 520 
1252 1 560-13 n 2245 1 484: 648 5 53173 s 1859 5 
1385 10 54613 n 2341 5 47880 h 1569 3 529°88 5 2861 7 
1421 1-5 542°81 n 97 470-58 1617 5 525°96 s 3225 2 
1487 5 53715 n 2595 1 465-91 n 1622 5 52555 s 3421 1 
1583 5 52869 n 2613 1 465°09 n 164215 523-94 g 3583 1 
1662 3 52237 h 2730 1 46001 n 1674 7 521:429 gs 3645 1 
1777 5 513°60 h 2739 1 45964 n 1735 672s 3773 3 
2033 1 49624 h 2875 454-23 h 17981351205 g 
2101 5 49212 h 3051 1 447°93 h 0 140 s PLATINUM. 
2263 5 483°02 n 3435 5 43562 n 1873 06°73 s A 
3421 8 436-05 n 3619 2 43032 n 2175 1-5 487°89 3 689 5 637°63 § 
179 42609 h =: 22.79-5e 482-12 913 ol 
TELLURIUM. } 145 939 8 
H PALLADIUM. 3963 4 421°57 5 950 5 
ved 37 643+ - : H A 958 5 
1 636-9 685 5 638-40 s TiN. 1041 5 584° 
vee ‘ e611 : 762 2 624-96 5 H a 1045 5 584288 
735 2 629-46 s 8837 2 613-72 s 27.3 1073 7 58080d 
765°33 624-44 n 995) 590-64 1076 10 580-48 n =: 1367-7 547°95 : 
774 3 623°07 s 1005 589-43 1219 2 563°36 8 1459 5 539598 
894 2 60484 s 1023 3 58707 8 1260 8 59°25 n 1484 5 53T4l 8 
917 1 60137 s 10315 58600 h 1284 8 557-63 n «1561 2 53076 8 
927 5 599°90 n 1056-7 582908 1484 1 537-40 5 1653 1 523°08 8 
597-26 068 142h 1506 2 536-45 1689 3 520°25 8 
97151 59366 s 1084 = 579-46 h ~=—«1520 1 634-21 h «1879 1 506328 
1030°35 58614 s 1127 3 574318 1524 4 533°85 n 9857 1 45492 8 
1035 ¢ 585°54.s 1129 1 57408 s 1546 1 §29°29 n «9986 3 40197 8 
1111 7 57621 n 1185 5 567-65 8 1657 3 522-75 n 9999 7 449°72 8 
1122 1 57490 s 1199 5 566-08 s 821 3 510-40 n 3156 1 444458 
1151 7 571°53 n 5 8 53 48617 n 3525 1 432968 
1204 ¢ 56553n 1219) cases), 220° 
6 565°53 n 1 63° s 
1230 1 562-65 g 1333 ¢ 569-29 bh snr 452.33 
T have stated above that the principal difficulty with which 
pa culty wi 
I have had to contend was the identification of a sufficient 
number of scale lines with lines of which the wave lengths hs had 
been measured either by Angstrém or by Ditscheiner. Upon 
| identific ork 
"ngths, selecting the lines about whose 
d be no doubt, When the formulas 
