( 296 ) 



Determinations made at other temperatures did not yield anything 

 particular. Only for the zero determination tlie corrections are some- 

 what different, as that for the reduction to the mean deflection is 

 no longer necessary. A new one, however, is added because the determi- 

 nation has not been made exactly at 0° C. but at a little higher 

 temperature. After what has been remarked about this in § 7, it seems 

 superfluous to illustrate this small variation by an instance. 



§ 9. Determinations of the resistance at 0° C They are made in three 

 series. For the first we still used leads of 0.5 m.m. (Comm. No. 77 

 ^ 2 and fig. 3), the insulating liquid was petroleum ether or amylene ; 

 for the second the leads were 5 m.m. thick (I.e. fig. 4), the insulating 

 liquid was isopenlane ; and the third (insulating liquid isopentane) 

 was that treated in ^ 6. 



§ 10. Detcriiiinations at loir A>/??^>t;/v;Y/iyv'.v. The measurements were 

 made at faii-ly gradually decreasing temperatui-es ; at the lowest 

 temperatures the intervals are smaller. 



The measurements will» the hydrogen theiinonieter (see Counn. 

 JS". 77 § 2) are made by Dr. W. Hfask to whom my best thanks 

 are due for the trouble he has taken. 



The determinations ai-e nuuk' up of two series. 



Thé first series was made between May lo and July 10, the 

 second series between Dec. 10 and Dec. 22, 1902. 



It seems desirable to consi(kM' the two series separately. 



The first series has yielded results that may be derived from the 

 following table. 



In order to judge how the values given here agree intei- se, I 

 have lirst calculated the formula of the form 



ID = w, (1 -i-at-^ bt'), 



