The air was damp and unwholesome--for the swamp had not been drained as in later times,--and the misty exhalations arising from it added to the obscurity.

Catesby, however, did not relax his pace, and his companions imitated his example.

Another turn on the right seemed to bring them still nearer the river, and involved them in a thicker fog.
All at once Catesby stopped, and cried, "We should be near the house.

And yet this fog perplexes me.

Stay here while I search for it." "If you leave us, we shall not readily meet again," rejoined Fawkes.
But the caution was unheeded, Catesby having already disappeared.