( 2ÜT ) 



which agrees with the observations at 0°, at — J 04°. 66 (-. and at 

 — 182°.63 C, tlie temperatures which best correspond with those whicii 

 as a I'ule are also used by other observers. 

 The formula becomes 



10 = 110.045 (1 + 0.0088788 t — 0.000 000 9257 t'). 

 The deviations of the observed resistances from the formula arc 

 given in the column Obs. — Comj)./ of table VI, and are quite 

 appreciable. In the case of metliyl chloride the deviation amounts to 

 65 on 87760 or a diHerence in temperaluri» ()fO°.l5(\ For methane 

 these deviations are 63 on 38674 or a dillbreiicc in lcui|)eraturc of 

 also 0°.15 C. In oxygen, boihng under reduced pressure, tlie deviation 

 is 90 on 21637 or about 0°.2 C. 



1) This observation is Ics-s reliable because an uncertain correclion to the 

 hydrogf'ii Ihernionieter allain(xl a rallicr lii^ii value. 



20* 



