Elect r 



'rued in Metallic Conduction. 

 Table III. 



Metal. 



Nickel .... 



Mercury.... 



Bismuth.... 



Cobalt .... 



Silver 



Copper .... 



Gold 



Magnesium 



Platinum . 



Lead 



Cadmium .. 

 j Antimony .. 



JTin 



I Zinc 



1 Aluminium 



1-79 



1-73 



1-90 



2 - 12 

 •181 

 •641 

 •366 

 •373 



2-06 



2-01 



1-13 



304 



1-48 



212 



1-44 



186 



2-87 

 1-93 

 190 



202 

 4-03 

 7-70 



11-8 

 2-06 

 1-73 

 4-43 

 163 

 3 55 

 2-60 

 3-64 



332 

 4-96 



3-65 

 4-03 

 3-67 

 2-62 

 2-82 

 4-42 

 4-26 

 3-48 

 501 

 4-94 

 525 

 5-48 

 5-23 



5-94 

 8-58 

 6-95 

 8-54 

 •664 

 1-68 

 103 

 1-65 

 8-78 



6-995 



566 



15-02 



7-77 



11-62 



753 



7-88 

 21-61 



9 84 

 11-75 

 1333 



6-43 



7-81 

 19-23 

 13-77 



8-05 

 2382 

 15-26 

 25-41 

 25-89 

 25-40 



so that on reduction 



Writing as before, V being the atomic volume, and p the 

 ratio of the number of free electrons to the number of atoms, 



then 



/d = 5-6 10 



m V 



,7TV 



X 2 



(K + * 2 -, 2 )( 



14- 



VK \ 



xc^oj* 



(U) 



where for good conductors, the last bracket is unity. In 

 the case of sodium light 



p=15-5910-3V(K + ^ 2 ~, 2 )(l + ^y . (45) 



Consider now the formula to which the hypothesis of equal 

 velocity of agitation would lead. Quoting Schuster*, we 

 have, in our present notation, 



v 2 -^ = K-47r^ 2 C 2 (a-)/(l-f <7o ^ 2 ( <7 )2 )? , (46) 



* L. c. p. 154. 

 Phil. Mag. S. 6. Vol. 22. No. 128. Aug. 1911. S 



