branch is 7 feet. To near Lapal, or Laplat, the canal passes through a tunnel 3776 yards long; at Gorsty Hill it passes through another of 623 yards, under a collateral branch of the Grand Ridge; and at Dudley there is another tunnel of 2926 yards in length, near the summit-level of the canal. The arch of this last tunnel has a height of 13½ feet. At Cradley Pool a large reservoir exists for supplying the lockage of the Black Delph branch. It is provided, that level cuts may be made from this canal towards any coal-mine to the extent of 2000 yards. A stop-lock is erected at the junction with the Worcester and Birmingham Canal, by which either company has a power of preventing the other from drawing off their head of water. The Black Delph branch was first executed, and this was then united with the Dudley part of the canal, which had been constructed by Lord Dudley and Ward; these were completed and in use before the extension or main length to Selly Oak was designed. The company was authorised to raise a capital of 229,100_l._, the amount of the shares being originally 100_l._ each. Owing to the different Acts under which the parts of the canal were progressively undertaken, the rates of tonnage differ considerably. CANALS IN WALES. The principal artificial waterways in Wales are the Swansea Canal, about 19 miles in length, which was opened in 1798, and which connects the harbour of Swansea with the various copper and other works between that point and Pen Tawe; the Neath Canal, which is about 14 miles in length, and which, commencing near Abernant, and terminating at Neath river harbour, with a branch to a short canal called the Briton Canal, near Giant’s Grave, Pill; the Aberdare Canal, which, about 6½ miles in length, connects the Glamorganshire Canal with Aberdare, and runs through a district of great mineral and manufacturing resources; and the Glamorganshire Canal, which in a total length of 25 miles has a rise of about 611 feet, and which, commencing on the east side of the Taff river, and near its entrance into Penarth harbour, terminates in the town of Merthyr Tydfil. The canal was opened between Merthyr and Cardiff in 1794, and at the end of the canal, which terminates in the Taff river, there is a sea-lock, with a floating dock, capable of admitting vessels of considerable tonnage. In May 1885 the Glamorganshire and Aberdare Canals, in South Wales, were transferred to the Bute Dock Company, who formally commenced working them in September 1887. The old system of conducting the traffic on these canals was to charge toll rates, but the Marquis of Bute has adopted the system of charging through rates from any place on the Bristol Channel to Cardiff.