It is said that the barrister who crams up a case with such care that he can examine an expert witness upon the Monday has forgotten all his forced knowledge before the Saturday. Certainly I should not like now to pose as an authority upon ceramics. And yet all that evening, and all that night with a short interval for rest, and all next morning, I was sucking in knowledge and committing names to memory. There I learned of the hall-marks of the great artist-decorators, of the mystery of cyclical dates, the marks of the Hung-wu and the beauties of the Yung-lo, the writings of Tang-ying, and the glories of the primitive period of the Sung and the Yuan. I was charged with all this information when I called upon Holmes next evening. He was out of bed now, though you would not have guessed it from the published reports, and he sat with his much-bandaged head resting upon his hand in the depth of his favourite armchair.

“Why, Holmes,” I said, “if one believed the papers, you are dying.”

“That,” said he, “is the very impression which I intended to convey. And now, Watson, have you learned your lessons?”

“At least I have tried to.”

“Good. You could keep up an intelligent conversation on the subject?”

“I believe I could.”

“Then hand me that little box from the mantelpiece.”

He opened the lid and took out a small object most carefully wrapped in some fine Eastern silk. This he unfolded, and disclosed a delicate little saucer of the most beautiful deep-blue colour.

“It needs careful handling, Watson. This is the real egg-shell pottery of the Ming dynasty. No finer piece ever passed through Christie’s. A complete set of this would be worth a king’s ransom - in fact, it is doubtful if there is a complete set outside the imperial palace of Peking. The sight of this would drive a real connoisseur wild.”

“What am I to do with it?”

Holmes handed me a card upon which was printed: “Dr. Hill Barton, 369 Half Moon Street.”

“That is your name for the evening, Watson. You will call upon Baron Gruner. I know something of his habits, and at half-past eight he would probably be disengaged. A note will tell him in advance that you are about to call, and you will say that you are bringing him a specimen of an absolutely unique set of Ming china. You may as well be a medical man, since that is a part which you can play without duplicity. You are a collector, this set has come your way, you have heard of the Baron’s interest in the subject, and you are not averse to selling at a price.”

“What price?”

“Well asked, Watson. You would certainly fall down badly if you did not know the value of your own wares. This saucer was got for me by Sir James, and comes, I understand, from the collection of his client. You will not exaggerate if you say that it could hardly be matched in the world.”

“I could perhaps suggest that the set should be valued by an expert.”

“Excellent, Watson! You scintillate to-day. Suggest Christie or Sotheby. Your delicacy prevents your putting a price for yourself.”

“But if he won’t see me?”

“Oh, yes, he will see you. He has the collection mania in its most acute form - and especially on this subject, on which he is an acknowledged authority. Sit down, Watson, and I will dictate the letter. No answer needed. You will merely say that you are coming, and why.”

It was an admirable document, short, courteous, and stimulating to the curiosity of the connoisseur. A district messenger was duly dispatched with it. On the same evening, with the precious saucer in my hand and the card of Dr. Hill Barton in my pocket, I set off on my own adventure.