She assented with apparent cheerfulness, and they climbed the stairs together. The last portion of them was uncarpeted, and their footsteps sounded with hollow echoes under the roof. It was all but dark by this time; Mr. Hood found matches on the table and lit the lamp, which illuminated the bare whitewashed walls and sloping ceiling with a dreary dimness. There was no carpet on the floor, which creaked as they moved here and there. When her father was on the point of drawing down the blind, Emily interposed.
'Do you mind leaving it up, father?'
'Of course I will,' he assented with a smile. 'But why?'
'The last daylight in the sky is pleasant to look at.'
On the landing below stood an old eight-day clock. So much service had it seen that its voice was grown faint, and the strokes of each hour that it gave forth were wheezed with intervals of several seconds. It was now striking nine, and the succession of long-drawn ghostly notes seemed interminable.
The last daylight—how often our lightest words are omens!—faded out of the sky. Emily kept her eyes upon the windows none the less. She tried to understand what her father was saying sufficiently to put in a word now and then, but her sense of hearing was strained to its utmost for other sounds. There was no traffic in the road below, and the house itself was hushed; the ticking of the old clock, performed with such painful effort that it ever seemed on the point of failing, was the only sign of life outside the garret. At length Emily's ear caught a remote rushing sound; her father's low voice did not overcome it.
'These compounds of nitrogen and oxygen,' he was saying, 'are very interesting. Nitrous oxide, you know, is what they call Laughing Gas. You heat solid nitrate of ammonia, and that makes protoxide of nitrogen and water.'
The words conveyed no sense to her, though she heard them. The rushing sound had become a dull continuous thunder. Her eyes strained into the darkness. Of a sudden the horizon flamed. A train was passing a quarter of a mile away, and the furnace-door of the engine had just been opened to feed the fire, whose strength sped the carriages to far-off London. A streaming cloud of smoke reflected the glare; it was as though some flying dragon vomited crimson fumes. Involuntarily the girl half rose from her seat and pointed.
'What is it?' asked her father, looking round. 'Ah! pretty sight that fire on the smoke. Well, this protoxide of nitrogen, you see—'