TABLE II

Behavior of Metals in Different Electrolytes

+------------------+-------------------+--------------------+
| CAUSTIC POTASH | HYDROCHLORIC ACID | POTASSIUM SULPHIDE |
+------------------+-------------------+--------------------+
| + Zinc | + Zinc | + Zinc |
| Tin | Cadmium | Copper |
| Cadmium | Tin | Cadmium |
| Antimony | Lead | Tin |
| Lead | Iron | Silver |
| Bismuth | Copper | Antimony |
| Iron | Bismuth | Lead |
| Copper | Nickel | Bismuth |
| Nickel | Silver | Nickel |
| - Silver | - Antimony | - Iron |
+------------------+-------------------+--------------------+

It is important to remember that in all cells, no matter what elements
or what electrolyte are used, the electrode _which is consumed_ is the
one that becomes _negatively charged_ and its terminal, therefore,
becomes the _negative terminal_ or _pole_, while the electrode _which
is not consumed_ is the one that becomes _positively charged_, and its
terminal is, therefore, the _positive terminal_ or _pole of the cell_.
However, because the current in the electrolyte flows from the
_consumed_ plate to the _unconsumed_ plate, the consumed plate is
called the _positive_ plate and the unconsumed, the _negative_. This
is likely to become confusing, but if one remembers that the _active_