The Golden Scorpion

square hole in the middle and peculiar characters engraved around the square, one on each of the four sides.

He failed to find the coin in his pocket, however, but he walked briskly up a side street until he came to the entrance to a tube station. Entering a public telephone call-box, he asked for the number, City 400. Being put through and having deposited the necessary fee in the box:

'Is that the Commissioner's Office, New Scotland Yard?' he asked. 'Yes! My name is Dr. Keppel Stuart. If Inspector Dunbar is there, would you kindly allow me to speak to him.'

There was a short interval, then:

'Hullo!' came—'is that Dr. Stuart?'

'Yes. That you, Inspector? I have just remembered something which I should have observed in the first place if I had been really wide-awake. The envelope—you know the one I mean?—the one bearing the number, 30, has been sealed with a Chinese coin, known as cash. I have just recognized the fact and thought it wise to let you know at once.'

'Are you sure?' asked Dunbar.

'Certain. If you care to call at my place later to-day I can show you some cash. Bring the envelope with you and you will see that the coins correspond to the impression in the wax. The inscriptions vary in different provinces, but the form of all cash is the same.'

'Very good. Thanks for letting me know at once. It seems to establish a link with China, don't you think?'

'It does, but it merely adds to the mystery.'

Coming out of the call-box, Stuart proceeded home, but made one or two professional visits before he actually returned to the house. He now remembered having left this particular cash piece (which he usually carried) in his dispensary, which satisfactorily accounted fro his failure to find the coin in his waistcoat pocket. He had broken the cork of a flask, and in the absence of another of correct size had manufactured a temporary stopper with a small cork to the top of which he had fixed the Chinese coin with a drawing-pin. His purpose served he had left the extemporized stopper somewhere in the dispensary.

Stuart's dispensary was merely a curtained recess at one end of the waiting-room and shortly after entering the house he had occasion to visit it. Lying upon a shelf among flasks and bottles was the Chinese coin with the cork still attached. He took it up in order to study the inscription. Then:

'Have I cultivated somnambulism!' he muttered.

Fragments of black sealing-wax adhered to the coin!

Incredulous and half fearful he peered at it closely. He remembered that the impression upon the wax sealing the mysterious envelope had had a circular depression in the centre. It had been made by the head of the drawing- pin!

He found himself at the shelf immediately above that upon which the coin had lain. A stick of black sealing wax used for sealing medicine was thrust in beside a bundle of long envelopes in which he was accustomed to post his Infirmary reports!

One hand raised to his head, Stuart stood endeavouring to marshal his ideas into some sane order. Then, knowing what he should find, he raised the green baize curtain hanging from the lower shelf, which concealed a sort of cupboard containing miscellaneous stores and not a little rubbish, including a number of empty cardboard boxes.

A rectangular strip had been roughly cut from the lid of the topmost box!

The mysterious envelope and its contents, the wax and the seal—all had come from his own dispensary!

Chapter 10 'Close Your Shutters at Night'

Inspector Dunbar stood in the little dispensary tapping his teeth with the end of a fountain-pen.

'The last time he visited you, doctor—the time when he gave you the envelope—did the cabman wait here in the waiting-room?'

'He did—yes. He came after my ordinary consulting hours and I was at supper, I remember, as I am compelled to dine early.'

'He would be in here alone?'

'Yes. No one else was in the room.'

'Would he have had time to find the box, cut out the piece of cardboard from the lid, put it in the envelope and seal it?'

'Ample time. But what could be his object? And why mark the envelope 30?'

'It was in your consulting-room that he asked you to take charge of the envelope?'

'Yes.'

'Might I take a peep at the consulting room?'

'Certainly, Inspector.'

From the waiting-room they went up a short flight of stairs into the small apartment in which Stuart saw his patients. Dunbar looked slowly about him, standing in the middle of the room, then crossed and stared out of the window into the narrow lane below.

'Where were you when he gave you the envelope?' he snapped suddenly.

'At the table,' replied Stuart with surprise.

'Was the table-lamp alight?'

'Yes. I always light it when seeing patients.'

'Did you take the letter into the study to seal it in the other envelope?'

'I did, and he came along and witnessed me do it.'

'Ah,' said Dunbar, and scribbled busily in his note-book. 'We are badly tied at Scotland Yard, doctor, and this case looks like being another for which somebody else will reap the credit. I am going to make a request that will surprise you.'

He tore a leaf out of the book and folded it carefully.

'I am going to ask you to seal up something and lock it away! But I don't think you'll be troubled by cowled burglars or beautiful women because of it. On this piece of paper I have written—a'—he ticked off the points on his fingers: 'what I believe to be the name of the man who cut out the cardboard and sealed it in an envelope; b: the name of the cabman; and, c: the name of the man who rang me up here last night and gave me information which had only just reached the Commissioner. I'll ask you to lock it away until it's wanted, doctor.'

'Certainly, if you wish it,' replied Stuart. 'Come into the study and you shall see me do as you direct. I may add that the object to be served is not apparent to me.'

Entering the study, he took an envelope, enclosed the piece of paper, sealed the lapel and locked the envelope in the same drawer of the bureau which once had contained that marked 30.

'Mlle. Dorian has a duplicate key to this drawer.' he said. 'Are you prepared to take the chance?'

'Quite,' replied Dunbar, smiling; 'although my information is worth more than that which she risked so much to steal.'

'It's most astounding. At every step the darkness increases. Why should anyone have asked me to lock up a blank piece of cardboard?'

'Why, indeed,' murmured Dunbar. 'Well, I may as well get back. I am expecting a report from Sowerby. Look after yourself, sir. I'm inclined to think your pretty patient was talking square when she told you there might be danger.'

Stuart met the glance of the tawny eyes.

'What d'you mean, Inspector? Why should I be in danger?'

'Because,' replied Inspector Dunbar, 'if 'The Scorpion' is a poisoner, as the chief seems to think, there's really only one man in England he has to fear, and that man is Dr. Keppel Stuart.'

When the Inspector had taken his departure Stuart stood for a long time staring out of the study window at the little lawn with its bordering of high neatly-trimmed privet above which at intervals arose the mop crowns of dwarf acacias. A spell of warm weather seemed at last to have begun, and clouds of gnats floated over the grass, their minute wings glittering in the sunshine. Despite the nearness of teeming streets, this was a backwater of