But the great elephants became a source of much pleasure to everyone. They were so perfectly tractable and manageable that the boys often went across country with them.
This was practice, and Duncan had a meaning for it.
Well, one day as Frank was entering the living-room of the fort, his eyes fell upon a curious mark upon a stone, which proved to be an arrow bent partly upwards. He followed its direction with his eye and on another stone found another arrow, then two or three more, and finally there was a square stone above the window with a cross over it, thus (cross symbol).
There were no more arrows.
Frank rushed out half frantic with joy.
"Duncan! Conal!" he shouted.
They were coming quietly up the hill.
"Come quick, boys, I've made a discovery!"
Then he led them in and pointed the arrows, and the stone marked with the (cross symbol).
"The diamonds are there," he said excitedly.