(#2 in the At the Earth's Core Series by Edgar Rice Burroughs)

PROLOGUE

SEVERAL YEARS had elapsed since I had found the op-portunity to do any big-game hunting; for at last I had my plans almost perfected for a return to my old stamping-grounds in northern Africa, where in other days I had had excellent sport in pursuit of the king of beasts.

The date of my departure had been set; I was to leave in two weeks. No schoolboy counting the lagging hours that must pass before the beginning of "long vacation" released him to the delirious joys of the sum-mer camp could have been filled with greater im-patience or keener anticipation.

And then came a letter that started me for Africa twelve days ahead of my schedule.

Often am I in receipt of letters from strangers who have found something in a story of mine to commend or to condemn. My interest in this department of my correspondence is ever fresh. I opened this particular letter with all the zest of pleasurable anticipation with which I had opened so many others. The post-mark (Algiers) had aroused my interest and curiosity, es-pecially at this time, since it was Algiers that was presently to witness the termination of my coming sea voyage in search of sport and adventure.

Before the reading of that letter was completed lions and lion-hunting had fled my thoughts, and I was in a state of excitement bordering upon frenzy.

It--well, read it yourself, and see if you, too, do not find food for frantic conjecture, for tantalizing doubts, and for a great hope.

Here it is:

DEAR SIR: I think that I have run across one of the most remarkable coincidences in modern literature. But let me start at the beginning:

I am, by profession, a wanderer upon the face of the earth. I have no trade--nor any other occupation.

My father bequeathed me a competency; some remoter ancestors lust to roam. I have combined the two and invested them carefully and without extravagance.

I became interested in your story, At the Earth's Core, not so much because of the probability of the tale as of a great and abiding wonder that people should be paid real money for writing such impossible trash. You will pardon my candor, but it is necessary that you understand my mental attitude toward this particular story--that you may credit that which fol-lows.

Shortly thereafter I started for the Sahara in search of a rather rare species of antelope that is to be found only occasionally within a limited area at a certain season of the year. My chase led me far from the haunts of man.

It was a fruitless search, however, in so far as antelope is concerned; but one night as I lay courting sleep at the edge of a little cluster of date-palms that surround an ancient well in the midst of the arid, shifting sands, I suddenly became conscious of a strange sound coming apparently from the earth beneath my head.

It was an intermittent ticking!

No reptile or insect with which I am familiar re-produces any such notes.