Theory of Rcfvaction in Gases. 489 



Hence at 7(.) cms. ami 1()° C. we get 



K = l + -000582. 

 Boltzmann gives 



K = l + -000558 at 76 cms. aud 16° C. 



When we remember that the basis of calculation has been 

 the dispersion and the temperature deviation, the agreement 

 is as close as we could expect. 



C avion Dioxide. 

 Ketteler gives for the dispersion 



^":^i:^ = 1-0034 from Li red to Xa. 

 If we take^ =8 for the Na line and 0° C, w^e get 



1-^ x-1818 



h 



= 1-0034. 



1- f^l-x-2697 



^=•038. 



Hence h 



hi 



My experiments may be reduced as follows. 



Temp. Ratio. 



lUo 9-960 



21-7 9-290' 



31-5 8-985 



74-9 7-845 



Ratio 



-0116 



. Multiplied by 



Divided b^ 



•038 < 



1+ — (1 + -00370. 1+ '^''^^<^{\--Et\ 



1+ 00372; ^ V <S /■ 



9-585 

 9-190 

 8-895 

 7 775 



9-955 

 9930 

 9-930 

 9-930 



10-025 

 10000 

 10-005 

 10-010 



Mean lO'OlO 



Hence 



•0004483 P I -005 8 P 



^"■^(1 + -0037/^)76 1 "^ (l + -0037O76r [ 



1 + 



•038 (9o 



O-S); 



