354 
Hydrogen (0°,760 mm) 
Carbon dioxide 
(0°,760 mm) 
»0 2 
46989.10 28 sec- 2 
56220.10 28 sec -2 
n 2 
J from 2742.10 28 sec -2 
j to 5 .10 28 sec -2 
( from 2 7 42.10 28 sec -2 
} to 5.10 28 sec -2 
C 2 
1^9 'I 028 Se0_2 
~. 10 28 sec- 2 
A e * N 
4 71 - 
0 m 
4.10 28 sec“ 2 
17 . 10 28 sec -2 
It must of course be remembered that the results just found have 
been calculated for hydrogen and carbon dioxide at 0° C. and 
760 millims. In this connection it may be well to remark that 
the fourth term varies directly as the density of the gas, the third 
as the square of the density, whereas the first term, in all proba¬ 
bility, is approximately (but not exactly) independent of the density. 
We hope we will be able to revert to this subject when we 
will take the phenomena of extinction into closer consideration. 
It will be seen that some of the results here obtained are suscep¬ 
tible of a somewhat different interpretation. 
Nakladem Akademii Umiejetnosei. 
Pod redakcya 
Sekretarza Wydzialu matem.-przyrod. Jozefa Rostafmskiego. 
Krakow. 1907. — Drukarnia Umwersytetu Jagielloriskiego, pod zarzadem J. Filipowskiego- 
15 Maja 1907. 
