But the watershed of any engine--whatever may be its donkey-power, and whatever that name implies--slops back where a closed spout changes suddenly to an open gutter, and sets up independent lakes and rivers. This one sent its overflow towards Sapps Court, the incline favouring its distribution along the gutter of the _cul-de-sac_, which lay a little lower than the main street it opened out of. Its rich, ochrous rivulets--containing no visible trace of haemorrhage, in spite of that abuse of an adjective--were creeping slowly along the interstices of cobblestone paving that still outlived the incoming of Macadam, when Dave and Dolly Wardle ventured out of their archway to renew a survey, begun the previous day, of the fascinating excavation in the main street. Here was an opportunity for active and useful service not to be lost. Dave immediately cast about to scrape up and collect such mud as came ready to hand, and with it began to build up an intercepting embankment to stop the foremost current, that was winding slowly, like Vesuvian lava, on the line of least resistance. Dolly followed his example, filling a garment she called her pinafore with whatever mould or _debris_ was attainable, and bringing it with much gravity and some pride to help on the structure of the dyke. A fiction, rather felt than spoken, got in the air that Sapps Court and its inhabitants would be overwhelmed as by Noah's flood, except for the exertions of Dave and his sister. It appealed to some friends of the same age, also inhabitants of the Court, and with their assistance and sympathy it really seemed--in this fiction--that a catastrophe might be averted. You may imagine what a drove of little grubs those children looked in the course of half an hour. Not that any of them were particularly spruce to begin with. However, there was the embankment holding back the dirty yellow water; and now the pump was running on steady-like, there didn't so much come slopping over to add to the deluge that threatened Sapps Court. The policeman--the only one supposed to exist, although in form he varied slightly--made an inquiry as to what was going on, to be beforehand with Anarchy. He said:--"What are you young customers about, taking the Company's water?" That seemed to embody an indictment without committing the accuser to particulars. But he took no active steps, and a very old man with a fur cap, and no teeth, and big bones in his cheeks, said:--"It don't make no odds to we, I take it." He was a prehistoric navvy, who had become a watchman, and was responsible for red lanterns hooked to posts on the edge of chasms to warn carts off. He was going to sleep in half a tent, soothed or otherwise by the unflagging piston of that donkey-engine, which had made up its mind to go till further notice.