They had just reached the side of a little incline when Peggy's bootlace, which she had neglected to fasten all the morning, tripped her up, and over she went, rolling into a prickly gorse-bush, while Bobby, who was so close behind that he could not stop himself, fell over her, and collapsed into a boggy hollow, where he lay panting for breath until Peggy picked herself up and hauled him out.