Jack followed the wheelbarrow-man to the next cross-street, the latter trying to scurry away from him but impeded by his own weight in rocks. Jack wondered whether all of the mines beneath this country might be interconnected so that they all benefited from the Doctor's project of pumping away the ground-water without having to share in the costs. Perhaps that explained why strangers, coming from the direction of the tower, made them so nervous. Not that one really needed a reason.