Among the more typical of the canals, in addition to those already mentioned, were--the Grand Junction Canal, connecting the Thames with the Trent, and thus with both the Mersey and the Humber; the Thames and Severn Canal; the Ellesmere, connecting the Severn with the Dee and the Mersey; the Barnsley Canal (of which Phillips says: "The beneficial effects of this canal, in a rich mineral country, hitherto landlocked, cannot fail to be immediately felt by miners, farmers, manufacturers and the country at large"); the Kennet and Avon (opening, according to the same authority, "a line of navigation, sixteen miles in length, over a country before very remote from any navigable river"); the Glamorganshire Canal ("has opened a ready conveyance to the vast manufactory of iron established in the mountains of that country"); the extensive network of the Birmingham Canal system; the Shropshire Union, which connects the Birmingham Canal with Ellesmere port, on the Mersey, and has branches to Shrewsbury, Llangollen, Welshpool and Newtown; and the Manchester, Bolton and Bury Canal. To the last-mentioned, constructed under an Act of Parliament passed in 1791, Baines alludes as follows in his "Lancashire and Cheshire":-- "The River Irwell flows directly down from Bury to Manchester, and the river Croal, which flows through Bolton, joins the Irwell between Bury and Manchester; but neither of these streams was considered available, by any amount of improvement that could be given to it, for the purposes of navigation. They are both of them very impetuous streams, occasionally sending down immense torrents of water, but at other times so shallow as not to furnish sufficient depth of water for the smallest vessels. Instead, therefore, of wasting time and money upon them, a canal was cut at a considerably higher level, but following the general direction of the river Irwell." The Manchester, Bolton and Bury Canal was thus a further example of the resort to artificial canals, with water channels capable of regulation, in preference to further schemes for rendering rivers navigable. {185}How the situation brought about by the creation of the network of navigable waterways thus spread, or being spread, throughout the country was regarded by an impartial observer in the "Canal Mania" period is shown by the following comments thereon by Dr Aikin:--