116 REPORTS ON THE STATE OF SCIENCE. 
Wave-length Tables of the Spectra of the Elements and Compounds.— 
Report of the Committee, consisting of Sir H. E. Roscor (Chair- 
man), Dr. MarsHaLL Watts (Secretary), Sir NorMAN LocKYER, 
Professor Sir James Dewar, Professor G. D. Livetna, Professor A. 
ScHusTER, Professor W. N. Hartiey, Professor WoLcotr Gisps, 
Sir W. DE W. Apney, and Dr. W. E. ADENEY. 
STANDARD LINES. 
Buisson and Fabry, ‘ C.R.,’ cxliii. p. 165 (1906) ; cxliv. p. 1155 (1907). 
Perot and Fabry, ‘ C.R.,’ exxxiii. p. 153 (1901). 
Kayser, ‘ Ann. d. Physik ’ (4), iti. p. 195 (1900). 
Eversheim, ‘ Zeitschrift fiir wissenschaftliche Photographie,’ v. 152 (1907). 
Wave-lengths in dry air at 15° C. and 760 mm. 
| : 
Ease Perot and Fabry Kayser Mae erisere. 
TeontAre Solar Spectrum Iron Are | Rowland 
6494-994 6495-209 | 
6471-666 Ca 71-885 
30°859 31-063 
08-027 Fe 08-231 
6393-612 | 6393°818 
35°342 | 6335°346 | 35-550 
22°706 Fe 22-912 
18-029 18-242 
6265-147 6265-347 
30°732 6230-746 30°946 
6191-569 6191-770 
6151°639 | 51:834 
37°700 | 
6065-493 6065°506 6065-708 
27-059 27-265 
| 16:650 Mn 16-856 
03-039 | 03-245 
5987-081 Fe | 5987-286 
5952-739 | 
34-683 34:666 | 34-883 
5892°882 Ni | | 5893-098 
| 5862-368 Fe | | 62-580 
57:760 Ni | 
05-211 Ni 05-448 
5763-013 5763-004 5763-215 
60°843 Ni 
15-095 | 15-309 
09-396 09-616 
5658-835 | 
15-658 5615-879 
Note.-—The wave-lengths now given by Buisson and Fabry rest on the value 
6438-4696, determined by Benoit, Fabry, and Perot for the red line of Cadmium, 
and those of Perot and Fabry on Michelson’s value 5085°8240 for the Cadmium green 
line. 
