24 ELECTRO-CHEMISTRY. 



with the water, and oxygen is the product; and 

 negative electricity combines with the water, and 

 hydrogen is the product? With a view to the 

 solution of this last question, I made the following 

 experiment : 



FIG. 4. 



30. Fig. 4 represents a glass vessel with two 

 compartments, C and D ; these compartments are 

 separated from each other by a platinum plate, A B, 

 ten inches in diameter. The compartments are 

 water-tight, insomuch that water, when poured into 

 one of the compartments, has no communication with 

 the other. G and H, are two tubulures, into which 

 stoppers are tightly fitted, and through which the 



