`Well, Mr Utterson, you are a hard man to satisfy, but I'll do it yet,' said Poole. `All this last week (you must know) him, or it, or whatever it is that lives in that cabinet, has been crying night and day for some sort of medicine and cannot get it to his mind. It was sometimes his way - the master's, that is - to write his orders on a sheet of paper and throw it on the stair. We've had nothing else this week back; nothing but papers, and a closed door, and the very meals left there to be smuggled in when nobody was looking. Well, sir, every day, ay, and twice and thrice in the same day, there have been orders and complaints, and I have been sent flying to all the wholesale chemists in town. Every time I brought the stuff back, there would be another paper telling me to return it, because it was not pure, and another order to a different firm. This drug is wanted bitter bad, sir, whatever for.'

`Have you any of these papers?' asked Mr Utterson.

Poole felt in his pocket and handed out a crumpled note, which the lawyer, bending nearer to the candle, carefully examined. Its contents ran thus: `Dr Jekyll presents his compliments to Messrs Maw. He assures them that their last sample is impure and quite useless for his present purpose. In the year 18 - , Dr J. purchased a somewhat large quantity from Messrs M. He now begs them to search with the most sedulous care, and should any of the same quality be left, to forward it to him at once. Expense is no consideration. The importance of this to Dr J. can hardly be exaggerated.' So far the letter had run composedly enough; but here, with a sudden splutter of the pen, the writer's emotion had broken loose. `For God's sake,' he had added, `find me some of the old.'

`This is a strange note,' said Mr Utterson; and then sharply, `How do you come to have it open?'

`The man at Maw's was main angry, sir, and he threw it back to me like so much dirt,' returned Poole.

`This is unquestionably the doctor's hand, do you know?' resumed the lawyer.

`I thought it looked like it,' said the servant, rather sulkily; and then, with another voice, `But what matters hand of write?' he said. `I've seen him!'

`Seen him?' repeated Mr Utterson. `Well?'

`That's it!' said Poole. `It was this way. I came suddenly into the theatre from the garden. It seems he had slipped out to look for this drug, or whatever it is; for the cabinet door was open, and there he was at the far end of the room digging among the crates. He looked up when I came in, gave a kind of cry, and whipped upstairs into the cabinet. It was but for one minute that I saw him, but the hair stood upon my head like quills. Sir, if that was my master, why had he a mask upon his face? If it was my master, why did he cry out like a rat and run from me? I have served him long enough. And then the man paused and passed his hand over his face.

`These are all very strange circumstances,' said Mr Utterson, `but I think I begin to see daylight. Your master, Poole, is plainly seized with one of those maladies that both torture and deform the sufferer; hence, for aught I know, the alteration of his voice; hence the mask and his avoidance of his friends; hence his eagerness to find this drug, by means of which the poor soul retains some hope of ultimate recovery - God grant that he be not deceived! There is my explanation; it is sad enough, Poole, ay, and appalling to consider; but it is plain and natural, hangs well together and delivers us from all exorbitant alarms.'

`Sir,' said the butler, turning to a sort of mottled pallor, `that thing was not my master, and there's the truth. My master' - here he looked round him, and began to whisper - `is a tall fine build of a man, and this was more of a dwarf.' Utterson attempted to protest. `O, sir,' cried Poole, `do you think I do not know my master after twenty years? do you think I do not know where his head comes to in the cabinet door, where I saw him every morning of my life? No, sir, that thing in the mask was never Dr Jekyll God knows what it was, but it was never Dr Jekyll; and it is the belief of my heart that there was murder done.'