192 PHENOMENA DEPENDENT ON MOLECULAR PATHS 79 



table. The numbers are referred to the centimetre, the 

 second, and the density of water as units, as were the values 

 for air which underlie them ; as, too, in the case of air, 

 they correspond to the temperature C. and the pressure 

 of 76 cm. of mercury. The values of the molecular weights 

 have been taken from the tables ofLothar Meyer and 

 Karl Seubert. 1 



From these numbers of Graham's the determinations 

 of von Obermayer 2 present deviations of no importance; 

 they also refer to the temperature C., and are reduced to 

 absolute measure by direct gauging of the capillary tubes. 



1 Zeitschr. f. anorg. Chemie, 1896, xiii. 231. 



2 Wiener Sitzungsber. Abth. 2, 1875, Ixxi. p. 281 ; 1876, Ixxiii. p. 433. 

 CarVs Repert.f. Experimentalphys. 1876, xii p. 13 ; 1877, xiii p. 130. 



