I have been unable to find out what "leads" in the quote below means. I hope some uk member will tell us.
"As this honour would have been an innovation and an experiment, Perch was fain to content himself by expressing as well as he could, in his manner, You are the light of my Eyes. You are the Breath of my Soul. You are the commander of the Faithful Perch! With this imperfect happiness to cheer him, he would shut the door softly, walk away on tiptoe, and leave his great chief to be stared at, through a dome-shaped window in the leads, by ugly chimney-pots and backs of houses, and especially by the bold window of a hair-cutting saloon on a first floor, where a waxen effigy, bald as a Mussulman in the morning, and covered after eleven o'clock in the day, with luxuriant hair and whiskers in the latest Christian fashion, showed him the wrong side of its head for ever."