“The least little movement!” said Valenglay, mechanically repeating Don Luis’ words.
“I call a little movement what one can make without an effort, almost without stirring, such as dipping one’s stick into a sheet of water, for instance, or . . .”
“Or what?”
“Well, or a heap of sand.”
Valenglay remained silent and impassive, with at most a slight shiver passing across his shoulders. He did not make the suggested movement. He had no need to make it. He understood.
The others also did not speak a word, struck dumb by the simplicity of the amazing truth which had suddenly flashed upon them like lightning. And, amid this silence, unbroken by protest or sign of incredulity, Don Luis went on quietly talking:
“If you had the least doubt, monsieur le président—and I see that you have not—you would dig your cane, no great distance, twenty inches at most, into the sand beneath you. You would then encounter a resistance which would compel you to stop. That is the bags of gold. There ought to be eighteen hundred of them; and, as you see, they do not make an enormous heap. A kilogram of gold represents three thousand one hundred francs. Therefore, according to my calculation, a bag containing approximately fifty kilograms, or one hundred and fifty-five thousand francs done up in rouleaus of a thousand francs, is not a very large bag. Piled one against the other and one on top of the other, the bags represent a bulk of about fifteen cubic yards, no more. If you shape the mass roughly like a triangular pyramid you will have a base each of whose sides would be three yards long at most, or three yards and a half allowing for the space lost between the rouleaus of coins. The height will be that of the wall, nearly. Cover the whole with a layer of sand and you have the heap which lies before your eyes . . .”
Don Luis paused once more before continuing:
“And which has been there for months, monsieur le président, safe from discovery not only by those who were looking for it, but also by accident on the part of a casual passer-by. Just think, a heap of sand! Who would dream of digging a hole in it to see what is going on inside? The dogs sniff at it, the children play beside it and make mudpies, an occasional tramp lies down against it and takes a snooze. The rain softens it, the sun hardens it, the snow whitens it all over; but all this happens on the surface, in the part that shows. Inside reigns impenetrable mystery, darkness unexplored. There is not a hiding-place in the world to equal the inside of a sand heap exposed to view in a public place. The man who thought of using it to hide three hundred millions of gold, monsieur le président, knew what he was about.”
The late prime minister had listened to Don Luis’ explanation without interrupting him. When Don Luis had finished, Valenglay nodded his head once or twice and said: