1164 



1 0.44^1^ 

 tl = 0.44 d u l — = — — 



1 H V^2 7i T A 1 H 



ill which /i was taken equal to 2.76 X ^^^^ ^^1'*^^ further 



ciirbon-dioxide 0.00r97 36250 0.0001388 239.7 



hvdiogen 0:0008987 169200 0.0000841 87 



mixture 1:1 0.0001423 116.2 



Tlie result of the calculation is .9,^3.136X1^^"^ a"^' •'>-i = 

 = 2.217 X10"^ aud hence 



o = i {s, + X,) = 2 676 X 10-8 . 

 For 7i^=n.,^kn 1 find Di .,== 0.453, whereas the limiting vahics 

 for pure C(J., and //„ become: Z), = Z^^ ^ 0.551. Observation has 

 given D = 0.53. 



The agreement with observation may be considered satisfactory. 

 The difference between JJ,^ and />, or D., which was discussed in 

 tlie pievious communication, is rather large: probably, as observed, 

 this is owing to the imperfections of the metliod of calculation by 

 averages followed in the tlieory. 



For argon and helium the following constants hold'): 



rl 

 Argon 0.001781 

 Helium 0.0001784 

 Mixture 3 : 2 



1 •■ 1 

 which give 



.s^, = 2.674 X 10-8 .,,^ _ J .775 X 10-^" hence = 2.224 X lO-s 

 and 



D'-/, = 0.535 D,= D, = 0-597 D (observed) ~ 0.70^). 



The agreement with observation is less close here than in the 

 former case ; it may be added, that Stefan's formula (after correction 

 for the molecular attraction) would, as the previous communication 

 shows, give a result closely agreeing with D^ =3 D^ according to 

 our formula and therefore also differing from the experimental value. 



1) K. ScHMiTT, Ann. d. Pliys. (4) 30, p. 393, 19U9. 



2) R. Schmidt. Ann d. Phys. (4) 14 p. 801. 1904. A. LoNius ib. 29 p. 664 

 1909. 



