He went down the two flights of stairs; then, as he was coming up again with the water-bottle filled, he sat down, in his night-shirt, on a step of the stairs where there was a draught, and drank, without a tumbler, in long pulls like a runner who is out of breath.  When he ceased to move the silence of the house touched his feelings; then, one by one, he could distinguish the faintest sounds.  First there was the ticking of the clock in the dining-room which seemed to grow louder every second.  Then he heard another snore, an old man’s snore, short, laboured, and hard, his father beyond doubt; and he writhed at the idea, as if it had but this moment sprung upon him, that these two men, sleeping under the same room—­father and son—­were nothing to each other!  Not a tie, not the very slightest, bound them together, and they did not know it!  They spoke to each other affectionately, they embraced each other, they rejoiced and lamented together over the same things, just as if the same blood flowed in their veins.  And two men born at opposite ends of the earth could not be more alien to each other than this father and son.  They believed they loved each other, because a lie had grown up between them.  This paternal love, this filial love, were the outcome of a lie—­a lie which could not be unmasked, and which no one would ever know but he, the true son.

But yet, but yet—­if he were mistaken?  How could he make sure?  Oh, if only some likeness, however slight, could be traced between his father and Jean, one of those mysterious resemblances which run from an ancestor to the great-great-grandson, showing that the whole race are the offspring of the same embrace.  To him, a medical man, so little would suffice to enable him to discern this—­the curve of a nostril, the space between the eyes, the character of the teeth or hair; nay less—­a gesture, a trick, a habit, an inherited taste, any mark or token which a practised eye might recognise as characteristic.

He thought long, but could remember nothing; no, nothing.  But he had looked carelessly, observed badly, having no reason for spying such imperceptible indications.

He got up to go back to his room and mounted the stairs with a slow step, still lost in thought.  As he passed the door of his brother’s room he stood stock still, his hand put out to open it.  An imperative need had just come over him to see Jean at once, to look at him at his leisure, to surprise him in his sleep, while the calm countenance and relaxed features were at rest and all the grimace of life put off.  Thus he might catch the dormant secret of his physiognomy, and if any appreciable likeness existed it would not escape him.

But supposing Jean were to wake, what could he say?  How could he explain this intrusion?

He stood still, his fingers clinched on the door-handle, trying to devise a reason, an excuse.  Then he remembered that a week ago he had lent his brother a phial of laudanum to relieve a fit of toothache.  He might himself have been in pain this night and have come to find the drug.  So he went in with a stealthy step, like a robber.  Jean, his mouth open, was sunk in deep, animal slumbers.  His beard and fair hair made a golden patch on the white linen; he did not wake, but he ceased snoring.