EXPERIMENTAL PHYSIOLOGY 



Copper pot. 



Zinc. 



Porous pot containing 

 dilute sulphuric acid. 



Sulphate of copper 

 (saturated solution). 



FIG. 3. DANIELL CELL. 



Zinc. 



Carbon. 



Manganese dioxide 

 in porous pot. 



Ammonium chloride 

 solution. 



FIG. 4. LECLANCH4 OBLL. 



