It was after supper, in his own sanctum—the room of the pink radiance and the innumerable trophies—that Lord John Roxton had something to say to us. From a cupboard he had brought an old cigar-box, and this he laid before him on the table.
"There's one thing," said he, "that maybe I should have spoken about before this, but I wanted to know a little more clearly where I was. No use to raise hopes and let them down again. But it's facts, not hopes, with us now. You may remember that day we found the pterodactyl rookery in the swamp—what? Well, somethin' in the lie of the land took my notice. Perhaps it has escaped you, so I will tell you. It was a volcanic vent full of blue clay."
The Professors nodded.
"Well, now, in the whole world I've only had to do with one place that was a volcanic vent of blue clay. That was the great De Beers Diamond Mine of Kimberley—what? So you see I got diamonds into my head. I rigged up a contraption to hold off those stinking beasts, and I spent a happy day there with a spud. This is what I got."
He opened his cigar-box, and tilting it over he poured about twenty or thirty rough stones, varying from the size of beans to that of chestnuts, on the table.
"Perhaps you think I should have told you then. Well, so I should, only I know there are a lot of traps for the unwary, and that stones may be of any size
