“Possibly,” admitted Mr. Carlyle.  “I am not a dental expert and I had no opportunity of examining Mr. Parkinson’s mouth in detail.  But what is the drift of all this?”

“His clothes?”

“Oh, just the ordinary evening dress of a valet.  There is not much room for variety in that.”

“You noticed, in fact, nothing special by which Parkinson could be identified?”

“Well, he wore an unusually broad gold ring on the little finger of the left hand.”

“But that is removable.  And yet Parkinson has an ineradicable mole—­a small one, I admit—­on his chin.  And you a human sleuth-hound.  Oh, Louis!”

“At all events,” retorted Carlyle, writhing a little under this good-humoured satire, although it was easy enough to see in it Carrados’s affectionate intention—­“at all events, I dare say I can give as good a description of Parkinson as he can give of me.”

“That is what we are going to test.  Ring the bell again.”

“Seriously?”

“Quite.  I am trying my eyes against yours.  If I can’t give you fifty out of a hundred I’ll renounce my private detectorial ambition for ever.”

“It isn’t quite the same,” objected Carlyle, but he rang the bell.

“Come in and close the door, Parkinson,” said Carrados when the man appeared.  “Don’t look at Mr. Carlyle again—­in fact, you had better stand with your back towards him, he won’t mind.  Now describe to me his appearance as you observed it.”

Parkinson tendered his respectful apologies to Mr. Carlyle for the liberty he was compelled to take, by the deferential quality of his voice.

“Mr. Carlyle, sir, wears patent leather boots of about size seven and very little used.  There are five buttons, but on the left boot one button—­the third up—­is missing, leaving loose threads and not the more usual metal fastener.  Mr. Carlyle’s trousers, sir, are of a dark material, a dark grey line of about a quarter of an inch width on a darker ground.  The bottoms are turned permanently up and are, just now, a little muddy, if I may say so.”

“Very muddy,” interposed Mr. Carlyle generously.  “It is a wet night, Parkinson.”

“Yes, sir; very unpleasant weather.  If you will allow me, sir, I will brush you in the hall.  The mud is dry now, I notice.  Then, sir,” continued Parkinson, reverting to the business in hand, “there are dark green cashmere hose.  A curb-pattern key-chain passes into the left-hand trouser pocket.”

From the visitor’s nether garments the photographic-eyed Parkinson proceeded to higher ground, and with increasing wonder Mr. Carlyle listened to the faithful catalogue of his possessions.  His fetter-and-link albert of gold and platinum was minutely described.  His spotted blue ascot, with its gentlemanly pearl scarfpin, was set forth, and the fact that the buttonhole in the left lapel of his morning coat showed signs of use was duly noted.  What Parkinson saw he recorded, but he made no deductions.  A handkerchief carried in the cuff of the right sleeve was simply that to him and not an indication that Mr. Carlyle was, indeed, left-handed.