Then with terrible thundering and vivid lightning a short rainy season was ushered in. The stream became flooded, so that fishing was now out of the question.

But Conal's little Lilywhite visited the fort every day, and--though I cannot say where she found them--never came without a fish, while just as often as not she brought the boys a present of delightful fruit.

The rain-clouds were scattered at last, and soon the country all around was greener and more lovely than ever the wanderers had seen it, while the most gorgeous of flowers seemed to spring into existence in the short s.p.a.ce of twenty-four hours.

Sport began again once more.

They still paid visits to the king, but these were not so welcome now to his sable majesty, for the goo-goo was all finished, and he cared for little else--with, of course, the exception of human flesh.

Conal was exceedingly well developed, and under certain conditions he would not have objected being reminded of this.

But when the king one day felt his arm and said something which Carrambo translated: "Ah, num-num! you plenty good to eat," Conal hardly relished the verdict.

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.

The stone, however, was so firmly cemented in that it defied any ordinary methods to get it out.

So they determined to dine first, and go to work on it afterwards.

But no one could think or speak of anything else except their hopes of finding the treasure.

The boys had made cocoa-nut-oil lamps, and by the little flicker of light these gave, they now set about attacking the flint-hard cement in earnest. They chipped it out bit by bit, and hard, tedious work they found it.

But they succeeded at last, and stood silent and with a kind of awesome delight. For there before them was the glad sparkle of diamonds--a sparkle that seemed to dim the light of their poor oil lamp.

"Boys," cried Duncan, "our fortune is made!"

The diamonds, however, were but few--eight in all--but of great size, and apparently of high value, although the boys were no judges.

The hole where they had lain was carefully cemented all round, and besides the diamonds they found here two or three nuggets of gold, and a tiny brick of cement about six inches by four by three.

Just one word was engraved thereon.

That word was evidently Spanish, though partly obliterated--ABRIR--

They hoped to find diamonds inside.

They did not, however; only a piece of parchment, on which many words were written which they could not understand.

They were just putting in the stone again, after carefully storing away the diamonds and parchment, when Viking sprang up fiercely barking, and with his hair erect all along his spine.

At the same moment they perceived a terrible face at the open window.

It was that of a savage in his war-paint--the lips were painted red, great red rings were around each eye, and cheeks and brow were daubed with spots of white.

"Idle curiosity, I suppose," said Duncan, "or a trick to frighten us.

For now that the goo-goo is all exhausted, I believe the king would like to see the very last of us."

When Carrambo came next day they told him about the terrible face at the window.

Carrambo considered for a moment, then shook his head.

"Dat no good," he said. "You close all de debbil pit?"

"Yes," said Duncan.

"Dat bad sabage see somefing, sah! He go tell de king. King make bobbery soon. Plaps cut all you troats, like he kill pore leetle Lilywhite to-mollow."

"What!" cried Conal, "kill Lilywhite! If he dares, I'll put a bullet through his fat and ugly phiz."

"Poh Lilywhite!" continued Carrambo, as if speaking to himself. "But,"

he added, "s'pose you come to-night, I take you to de hut. Lily come back heah; den not die."

Conal at once agreed, and Carrambo came for him some hours after sunset.

The butchering hut was at a considerable distance from the main village, and, strange to say, unguarded. But they crept in and found Lily bound hand and foot.

She was speedily rescued, and in an hour's time they were all back at the fort.

But Conal had seen something that night which seriously alarmed both him and his companions.

The savages were squatted out-of-doors around fires, and all in war-paint.

They looked fierce and terrible.

Very busy, too, were they, sharpening horrid knives and spears.