[Illustration:
| Mr. Dumkins >>-->
|------------------------> |
| <------------------- |
| -------------------> |
1 |<----------------------- |
| |
| <------------------------|
| -------------------> |
| <------------------- |
| ----------------------->|
| <--<< Mr. Podder |
| Mr. Luffey >>-->
|------------------------> |
| <------------------- |
| ----------------------->|
2 | |
|<----------------------- |
| -------------------> |
| <------------------------|
<--<< Mr. Struggles |
]
The diagram No. 1 will show that as neither Mr. Podder nor Mr. Dumkins
can ever have been within the crease opposite to that from which he
started, Mr. Dumkins would score nothing by his performance. Diagram No.
2 will, however, make it clear that since Mr. Luffey and Mr. Struggles
have, notwithstanding their energetic but careless movements, contrived
to change places, the manoeuvre must increase Mr. Struggles's total by
one run.