27 i- Prof. Challis on a Theory of the Dispersion of Light. 

 Table (continued). 











Excess of calculated wave- 



Designa- 

 tion of 



Kirchhoff'i 



Ditschei- 

 ner's refrac- 



Ditschei- 

 ners wave- 





length. 











ray. 





tive index. 



length. 



By first 

 calcula- 

 tion. 



By second 

 calcula- 

 tion. 



Mean. 





22337 



1-63446 



47371 



4 33 



4- 9 



4 21 





2264 3 



1-63492 



47106 



4- 42 



4 17 



4 30 





2309-0 



1-63560 



46742 



4 35 



4 10 



4 22 





2416-0 



1-63718 



46097 



-143 



-169 



-156 





2436-5 



1-63743 



45901 



- 73 



- 99 



- 86 





24674 



1-63789 



45606 



— 7 



- 32 



- 20 





2489-4 



1-63818 



45409 



4 49 



4 23 



4 36 





25371 



1-63886 



45089 



4 42 



4- 17 



4 30 





2566-3 



1-6392S 



44880 



+ 54 



4 28 



4 41 





26060 



1-63986 



44633 



4- 33 



4 7 



4 20 





26270 



1-64013 



44498 



4- 45 



4- 20 



4 32 





2638-6 



1-64031 



44418 



4 44 



4 18 



4 31 





2670-0 



1-64080 



41222 



+ 22 



- 4 



4 9 





2686-6 



1-64101 



44121 



4 30 



4 5 



4 17 





272Y6 



1-64150 



43908 



4 30 



4 5 



4 18 





2734-9 



1-64168 



43813 



4- 48 



4 23 



4 35 





2775-6 



1-64224 



43600 



4 23 



- 2 



4 11 





27970 



1-64251 



43466 



4- 44 



4- 20 



4 32 





2822-8 



1-64287 



43314 



4 48 



4 23 



4 36 



G 



2854-7 



1-64334 



43170 







- 24 



- 12 





2S697 



1-64352 



43070 



4- 27 



4 3 



4 15 



a 



A 



y 



d 



e 





1-64369 

 1-64421 

 1-64448 

 1-64476 

 1-64511 



42953 

 42789 

 42668 

 42555 

 42425 



4- 76 

 4 34 

 + 50 

 4 54 



4- 50 



4 52 

 4 10 

 4 26 

 4 31 

 4 27 



4 64 

 4 22 



4- 38 

 4- 42 

 4 38 











B 





1-64536 



42325 



4- 55 



4 32 



4 43 



(, 





1-64569 



42238 



+ 18 



— 5 



4 7 



e 



1 





1-64606 

 1-64630 



42069 

 41871 



4 49 

 4-159 



4 27 

 4136 



4 38 

 4148 





K 





1-64687 



41792 



4- 31 



4 9 



4 20 



/* 



V 





1-64742 

 1-64771 



41626 

 41498 



4- 1 

 4- 27 



- 22 



4- 5 



- 11 

 4 16 





r 



E 









1-64819 

 1-64893 

 1-64941 



41392 

 41077 



40876 



- 35 



4- 27 



4- 67 



- 56 



4 7 

 4 47 



- 45 



4 17 

 4 57 







7T 





1-64966 



40829 



4- 31 



4 11 



4 21 



<7 



Z 



T 





1-65009 

 1-65064 

 1-65113 



40685 

 40506 

 40392 



4- 34 



4- 35 



- 7 1 



4 14 

 + 16 



- 26 



- 24 

 4 25 



- 17 











II 



H ' 1 





1-65194 

 1-65317 

 1-65435 



40117 

 39742 

 39405 ! 



4 15 



4 17 



4 8 : 



- 3 

 



— 8 



4 6 



4 8 













In the foregoing Table Fraunhofer's principal rays are indi- 

 cated, as usual, by the letters B, Q, D, E, F, G, H. The other 

 letters were employed by Ditscheiner to designate lines for which 

 there were no measures by Kirchhoff. The numbers opposite to 



