1878. ] 301 [Chase. 
Strontium, K. H.—Continued. 
Wave-lengths., Quotients. Theoretical. 
549.11 549.78 1.1680 1.1666 1.1675 14-30 
548.68 548.75 1.1689 1.1686 1.1691 1+3e 
525.98 525.95 1.2194 1.2195 1.2195 1+t4a 
524.18 524.26 1.2236 1.2234 1.2234 1+ 46 
523.24 523.23 1.2258 1.2258 1.2255 1+4e 
522.97 522.83 1.2264 1.2268 1.2266 1+pd 
522.71 522.60 1.2270 1.2278 1.2272 jet as y ae) 
The ratio between the first and the ninth harmonic increment, » = 1.4232, 
is my theoretical value for the ratio between heat of constant pressure and 
heat of constant volume ;* the ratio between the second and the tenth har- 
monic increment, 1/ 2, is the ratio between dissociative- or wave-velocity, 
and stable- or circular-velocity. The geometric mean of 1.1645, 1.1680, 
1.1689, is 1.1671 =1-+ 30/; (1.2194 x 1.2236 x 1.2258)3 — 1.2229 — 1 
+406’. Huggins’s means are not so theoretically exact, but their devia- 
tion is far within the limits of probable error, for (1.1649 x 1.1666 x 
1.1686) — 1.1668; (1.2195 x 1.2234 x 1.2858)3 — 1.2229;1 4+ 3B” 
= 1.1670; 1 + 4 6’ = 1.2227. Kirchhoff gives the following additional 
lines : 
(2) Strontium, K. 
Wave-lengths, Quotients. Theoretical. 
650.68 9857 
554.52 1.1566 
461.69 1.3892 1.5893 1+ 4a’ 
461.62 1.3894 1.3898 1+ 45d’ 
431.38 1.4868 1.4867 1+ 5a’ 
431.18 1.4875 1.4872 1+ 50! 
Puiatinum, K H. 
Wave-lengths. Quotients. Theoretical. 
598.22 598.14 1.0000 1.0000 1.0000 
596.86 596.59 1.0023 1.0026 1.0026 1+ 3a 
595.62 595.47 1.0044 1.0045 1.0044 1+ 54 
548.07 547.95 1.0915 1.0916 1.0910 1+56 
530.70 530.76 1.1272 1.1270 1.1275 1+ 75 
523.10 523.08 1.1486 1.1485 1.1419 1+7e 
506.43 506.32 1.1812 1.1813 1.1825 1+9¢ 
456.19 454.92 1.3113 1.3148 1.3129 1+ 20d 
450.77 449,72 1.8271 1.3300 1.38285 1+ 21d 
445.65 444.45 1.3424 1.3455 1.3442 1+ 22d 
This is not given among the comparisons in Gibbs’s Table XI, but it 
embraces all the lines in which Huggins’s measurements (Table [V) and 
* Proc. Soc. Phil. Amer., xiv, 651. 
