`Thank you no' the other answered. He waited until Dr Fell had replaced the disreputable, case. Then he produced an elaborately chased silver cigarette-case of his own, containing long and slender cigarettes with a cork tip. Snapping on a silver lighter, he applied it to a cigarette with nicety.

Dr Fell studied him sleepily, hands folded over his stomach. Arbor seemed to grow a trifle restless. He cleared his throat.

'I do not wish to hurry you, Inspector,' he said at length, `but I should like to point out that I have been put to considerable inconvenience this afternoon. If you will tell me what you wish to know, I shall be happy to assist you in any way I can?

Dr Fell nodded. `Got any Poe manuscripts?' he inquired, rather like a customs officer asking for contraband.

The question was so sudden that Arbor stiffened. A faint frown ruffled his swarthy forehead. 'I don't think I quite understand you. At my home in New York I certainly have a number of first editions of Edgar Allan Poe, and a few of the manuscript originals. But I scarcely think they would be of interest to you. I understand you wished to question me concerning a murder.'

`Oh, the murder!' grunted Dr Fell, with a careless wave of his hand. `Never mind that.'

`Indeed?' said Arbor. `I had supposed that the police might have some curiosity concerning it. However, that is none of my affair. I must remark, with Pliny "Quot homines, tot sententiae'.'

`It wasn't Pliny,' said the doctor, testily. `That's an inexcusable blunder. And if you must use that deplorable platitude, try to pronounce it correctly. The "o" in homines is short, and there's no long. nasal sound to the "en" in sententiae But never mind that. What do you know about Poe?'

Hadley was making weird noises in the corner. Mr Arbor's flattish face had stiffened; the aura about him conveyed anger.

`I am not sure,' he said, quietly, `that I know what you are driving at or whether this is an elaborate joke. If so, kindly tell me.?