Measurement, however, would virtually concede the theory of erosion. Before either ice or water.
| 200|26 |5·6 |24·8|11 |30 |--|50·8| 10 |24·8| -- | Rhode Island | 210|26 |6·5 |24 |11 |30 |1 |46 | -- |24·5|14 |30 |1 |60 | 12 |20 |·50 | Massachusetts| 200|29·5|8·5 |22 |10 |28 |2.