After this, seeing that the autumn warmth was passing away, I set myself with more system to my task, and within the next six months worked with steadfast will, and strenuous assiduity, seeking, not indeed for a man in a mine, but for some evidence of the possibility that a man might be alive, visiting in that time Northumberland and Durham, Fife and Kinross, South Wales and Monmouthshire, Cornwall and the Midlands, the lead mines of Derbyshire, of Allandale and other parts of Northumberland, of Alston Moor and other parts of Cumberland, of Arkendale and other parts of Yorkshire, of the western part of Durham, of Salop, of Cornwall, of the Mendip Hills of Somersetshire, of Flint, Cardigan, and Montgomery, of Lanark and Argyll, of the Isle of Man, of Waterford and Down; I have gone down the 360-ft.  Grand Pipe iron ladder of the abandoned graphite-mine at Barrowdale in Cumberland, half-way up a mountain 2,000 feet high; and visited where cobalt and manganese ore is mined in pockets at the Foel Hiraeddog mine near Rhyl in Flintshire, and the lead and copper Newton Stewart workings in Galloway; the Bristol coal-fields, and mines of South Staffordshire, where, as in Somerset, Gloucester, and Shropshire, the veins are thin, and the mining-system is the ‘long-wall,’ whereas in the North, and Wales, the system is the ‘pillar-and stall’; I have visited the open workings for iron ores of Northamptonshire, and the underground stone-quarries, and the underground slate-quarries, with their alternate pillars and chambers, in the Festiniog district of North Wales; also the rock-salt workings; the tin, copper and cobalt workings of Cornwall; and where the minerals were brought to the surface on the backs of men, and where they were brought by adit-levels provided with rail-roads, and where, as in old Cornish mines, there are two ladders in the shaft, moved up and down alternately, see-saw, and by skipping from one to the other at right moments you ascended or descended, and where the drawing-up is by a gin or horse-whinn, with vertical drum; the Tisbury and Chilmark quarries in Wiltshire, the Spinkwell and Cliffwood quarries in Yorkshire; and every tunnel, and every recorded hole:  for something urged within me, saying:  ‘You must be sure first, or you can never be—­yourself.’

* * * * *

At the Farnbrook Coal-field, in the Red Colt Pit, my inexperience nearly ended my life:  for though I had a minute theoretical knowledge of all British workings, I was, in my practical relation to them, like a man who has learnt seamanship on shore.  At this place the dead were accumulated, I think beyond precedent, the dark plain around for at least three miles being as strewn as a reaped field with stacks, and, near the bank, much more strewn than stack-fields, filling the only house within sight of the pit-mouth—­the small place provided for the company’s officials—­and even lying over the great mountain-heap of wark, composed