86 Dr. Matthiessen on the Electric Conducting Power of 



Of these numbers the mean of the values X for each of the 

 metals has been taken, and considered to hold good for the mean 

 of the temperatures T. In this way we find, the conducting 

 power of silver at 0° C. being = 100, that of 



Sodium 

 Magnesium 

 Calcium . 

 Potassium 

 Lithium . 

 Strontium 



at 21-7 C, = 37-43 

 170 = 25-47 



16-8 

 20-4 

 200 

 200 



= 22-14 

 = 20-85 

 = 1900 

 = 6-71 



The potassium and sodium used for the experiments were 

 commercial. The calcium, strontium, magnesium, and lithium 

 were obtained elcctrolytically, as described in the Chem. Soc. 

 Quart. Journ. vol. \m, pp. 107, 143. 



