336 
D = 10629 ... K = 1,000282 
10707 ... 280 
10924 ... 275 
11033,5 ... 272 
The mean of Boltzmann's (1874) and Klemencic's (1885) observed 
values is 
1,000264; 
the agreement is anything but satisfactory; to this, however, impor¬ 
tance cannot be attached. 
To evaluate let us use equation (4), § 15.; taking D and A 
according to (3) (these are probably the most accurate values of 
the constants), we obtain 
(14) = 0,87. 
From Scheel's a and b we deduce A 0 = 0,82. 
§ 17 . Oxygen. Very few measurements have been made upon 
the dispersion of this substance. Lorenz gives the following results: 
a) ,2 = 5,893 ... v = 1,00027155 
b) 6,708 . . . 27034 
from which 
(1) ‘ D = 5633 ; 4 = 3,76 
can be deduced. Mascart's results x ) are as follows 
a) y 1 = 5,085 ... v = 1,0002719 
b) 5,378 . . . 2714 
c) 5,896 . . . 2702 
d) 6,438 . . . 2696 
f From a) and d) we find A = 3,24 
} . . . b) and c ) ... 4,22 
the mean A = 3,73 agrees closely with Lorenz' value (1). If we 
accept the values (1) of the constants, equation (3), § 15., gives 
for i = 86,9 ... v = 1,0002663. 
1 ) Dufet, l. c., p. 76. 
