1883.] the Electromotive Force and Resistance of Batteries* 53 



obtained in cooling the cell from 12° C. to nearly so low a tempera- 

 ture as the freezing point of water. A very similar explanation 

 .applies to the curve abcde. 



Diagram I. 



The results thus laid down by means of the curves ABCDE and 

 abcde present many points of interest. These curves clearly show : — 



1°. That when a Daniell cell is heated from a low temperature, say 

 0° 0,, up to a high temperature, say 100° C, the resistance of the 

 cell decreases rather abruptly at first, but more gradually afterwards, 

 falling from 2' 12 to 0*66 ohm, or more than one- third. 



2°. That when the cell thus heated up is cooled down, the resistance 



