This he finds in the quantity of water decomposed by the current.

He tests this measure in all possible ways, to assure himself that no error can arise from its employment.

He places in the course of one and the same current a series of cells with electrodes of different sizes, some of them plates of platinum, others merely platinum wires, and collects the gas liberated on each distinct pair of electrodes.

He finds the quantity of gas to be the same for all.
Thus he concludes that when the same quantity of electricity is caused to pass through a series of cells containing acidulated water, the electro-chemical action is independent of the size of the electrodes.[3] He next proves that variations in intensity do not interfere with this equality of action.

Whether his battery is charged with strong acid or with weak; whether it consists of five pairs or of fifty pairs; in short, whatever be its source, when the same current is sent through his series of cells the same amount of decomposition takes place in all.