EXPERIMENTAL PHYSIOLOGY 



4- - 



Copper pot L __ "/ - 



Zinc. 



Porous pot containing 

 dilute sulphuric acic 

 or zinc sulphate. 



Sulphate of copper 

 (saturated solution). 



FIG. 3. Daniell cell. 



Zinc. 



- Carbon. 



Manganese dioxide 

 in porous pot. 



Ammonium chloride 

 solution. 



FIG. 4. Leclanche cell. 



