28 



On the Specific Resistance of Mercury. 



[May 4, 



Four tubes were used to contain the mercury, of lengths varying 

 from 87 to 194 centims.. The diameter of the three first tubes was 

 about 1 millim. and that of the fourth about 2 millims. The final 

 numbers obtained from the several fillings of the tubes are as 

 follows : — 



Tube I. 



Tube II. 



Tube III 



Tube IV 



95386 

 95412 

 95424 

 95436 

 95421 



95389 

 95414 

 95437 

 95436 



95424 

 95418 

 95399 

 95425 



95440 

 95415 



Y Mean '95416 



Mean '95419 



Mean '95416 



Mean '95427 



Combining the results of the present paper with our determination 

 of the B.A. unit in absolute measure, we get 



1 mercury nait= '94130 x 10 9 C.G.S. 



