He was now upon the roof. There he met with more difficulty. Partly covered with zinc and partly with slate, this roof--the whole length of which he must traverse--was so steep and slippery that no one could stand erect on it. Gilbert seated himself and remained motionless for a moment to recover himself, and the better to decide upon his course. A few steps from this point, a huge dormer window rose, with triangular panes of glass, and reached to within two feet of the spout. Gilbert resolved to make his way by this narrow pass, and from tile to tile he pushed himself in that direction. It will readily be believed that he advanced but slowly, much more so on account of his left arm, which, as it still pained him, required to be carefully managed; but by dint of patience and perseverance he passed beyond the dormer window, and at length arrived safely at the extremity of the roof, just in front of Stephane's window. "God be praised, the most difficult part is over," he said to himself, breathing freely. But he was far from correct in his supposition. It is true he had now only to descend upon the little roof, cross it, and climb to the window, which was but breast-high; but before descending it was necessary to find some support--stone, wood or iron, to which he could fasten the second rope, which he had brought wound about his neck, shoulders, and waist. Unfortunately he discovered nothing. At last, in leaning over, he perceived at the outer angle of the wall a large iron corbel, which seemed to sustain the projecting roof; but to his great chagrin, he ascertained at the same time, that the great roof passed three feet beyond the line of the small one, and that if even he should succeed in attaching his second rope to the corbel, the other end of it would float in empty space. This reflection made him shudder; and turning his eyes from the precipice, he examined the ridge-pole, where he thought he saw a piece of iron projecting. He was not mistaken: it was a kind of ornamental molding, which formed the pediment of the ridge. It was not without great effort that he raised himself even there, and when he found himself seated astride the beam, he rested a few moments to breathe, and to study the strange spectacle before him. His view embraced an immense extent of abrupt, irregular roofing, from every part of which rose turrets of every kind, in the shape of extinguishers, pointed gables, corners, retreating or salient angles, bell-towers, open to the daylight, profound depths where the gloom thickened, grinning chimneys, heavy weathercocks cutting the milky way with their iron rods and feathered arrows; from the top of the chapel steeple a great cross of stone, seeming to stretch out its arms; here and there the whitish zinc, cutting the dark blue of the slates; in spots an indistinct glittering and flashes of pale light enveloped in opaque shadows, and then the tops of three or four large trees which extended beyond the eaves,