I turned to Pugh. I "fixed" him with my glance.

"_I_ want to sell you a diamond. Here it is. What will you give me for

it?"

Taking the crystal from my waistcoat pocket I handed it to the man on the

other side of the counter. Directly, he got it between his fingers, and

saw that it was that he had got, I noticed a sudden gleam come into his

eyes.

"This is--this is rather a fine stone."

Pugh nudged my arm.

"I told you so." I paid no attention to Pugh. "What will you give me for

it?"

"Do you mean, what will I give you for it cash down upon the nail?"

"Just so--what will you give me for it cash down upon the nail?"

The man turned the crystal over and over in his fingers.

"Well, that's rather a large order. We don't often get a chance of buying

such a stone as this across the counter. What do you say to--well--to ten

thousand pounds?"

Ten thousand pounds! It was beyond my wildest imaginings. Pugh gasped. He

lurched against the counter.

"Ten thousand pounds!" he echoed.

The man on the other side glanced at him, I thought, a little curiously.

"If you can give me references, or satisfy me in any way as to your _bona

fides_, I am prepared to give you for this diamond an open check for ten

thousand pounds, or if you prefer it, the cash instead."

I stared; I was not accustomed to see business transacted on quite such

lines as those.

"We'll take it," murmured Pugh; I believe he was too much overcome by his

feelings to do more than murmur. I interposed.

"My dear sir, you will excuse my saying that you arrive very rapidly at

your conclusions. In the first place, how can you make sure that it is a

diamond?"

The man behind the counter smiled.

"I should be very ill-fitted for the position which I hold if I could not

tell a diamond directly I get a sight of it, especially such a stone as

this."

"But have you no tests you can apply?"

"We have tests which we apply in cases in which doubt exists, but in this

case there is no doubt whatever. I am as sure that this is a diamond as I

am sure that it is air I breathe. However, here is a test."

There was a wheel close by the speaker. It was worked by a treadle. It was

more like a superior sort of traveling-tinker's grindstone than anything

else. The man behind the counter put his foot upon the treadle. The wheel

began to revolve. He brought the crystal into contact with the swiftly

revolving wheel. There was a s--s--sh! And, in an instant, his hand was

empty; the crystal had vanished into air.

"Good heavens!" he gasped. I never saw such a look of amazement on a human

countenance before. "It's splintered!"

The Lock and Key Library: Classic Mystery and Detective Stories: Modern English · 第 75 / 82 题