Another feature of the Birmingham Canal system is that it passes to a considerable extent through the mining districts of the Black Country. This means, in the first place, that wherever important works have been constructed, as in the case of tunnels, (and the system passes through a number of tunnels, three of these being 3,172 yards, 3,027 yards, and 3,785 yards respectively in length) the mineral rights underneath have to be bought up in order to avoid subsidences. In one instance the railway company paid no less than £28,500 for the mining rights underneath a short length (754 yards) of a canal tunnel. In other words, this £28,500 was practically buried in the ground, not in order to work the minerals, but with a view to maintain a secure foundation for the canal. Altogether the expenditure of the company in this one direction, and for this one special purpose alone, in the Black Country district, must amount by this time to some hundreds of thousands of pounds. Actual subsidences represent a great source of trouble. There are some parts of the Birmingham Canal where the waterway was originally constructed on a level with the adjoining ground, but, as more and more coal has been taken from the mines underneath, and especially as more and more of the ribs of coal originally left to support the roof have been removed, the land has subsided from time to time, rendering necessary the raising of the canal. So far has this gone that to-day the canal, at certain of these points, instead of being on a level with the adjoining ground, is on an embankment 30 feet above. Drops of from 10 to 20 feet are of frequent occurrence, even with narrow canals, and the cost involved in repairs and restoration is enormous, as the reader may well suppose, considering that the total length of the Birmingham Canal subject to subsidences from mining is about 90 miles. I come next to the point as to the comparative narrowness of the Birmingham Canal system and the small capacity of the locks--conditions, as we are rightly told, which tell against the possibility of through, or even local, traffic in a larger type of boat. Such conditions as these are generally presented as one of the main reasons why the control should be transferred to the State, to municipalities, or to public trusts, who, it is assumed, would soon get rid of them. The reader must have fully realised by this time that the original size of the waterways and locks on the Birmingham Canal was determined by the question of water supply. But any extensive scheme of widening would involve much beyond the securing of more water.